Name ____________________ Date _______________ Subject ________ Chapter Exam Solving Linear Equations Part I Matching (4 Points Each) DIRECTIONS Write the correct letter in the blank next to each term. Answer choices will only be used once and some choices will not be used. 1 _C_ Algebraic Equations 2 _F_ Equivalent Equations 3 _G_ Function 4 _A_ Like Terms 5 _B_ Solution 6 _E_ Variable TEKS 111.32 (6) Underlying mathematical processes. Many processes underlie all content areas in mathematics. As they do mathematics, students continually use problemsolving, language and communication, and reasoning (justification and proof) to make connections within and outside mathematics. Students also use multiple representations, technology, applications and modeling, and numerical fluency in problemsolving contexts. Rationale: These vocabulary terms are essential for the students to know when attempting to solve a linear equation. D and H have no match in this exercise. D describes a ratio and H describes an identity. The other six terms have a matching definition. A Items that contain the same variable raised to the same power B Any value that satisfies an equation C Equations which can include real and complex numbers and variables D A comparison of two numbers by division E An expression with no fixed numerical value F Describes equations that share a common solution or solutions G A relationship between two mathematical sets, in which each member of one set corresponds uniquely to a member of the other set H An equation that is true for every value of the variable Page 1 Name ____________________ Date _______________ Subject ________ Chapter Exam Solving Linear Equations Part II Multiple Choice (6.5 Points Each) DIRECTIONS Read each problem and solve for and circle the correct answer. 1 Solve for 𝑦 in the equation. 3𝑦 + 12 = 6. A −6 B −2 C 2 D 6 TEKS 111.32 4 (A) find specific function values, simplify polynomial expressions, transform and solve equations, and factor as necessary in problem situations; (B) use the commutative, associative, and distributive properties to simplify algebraic expressions; and Rationale: Students should be able to solve a simple equation with one variable. The answer choices (A, C, D) are good distracters because they are the results you get if you change the sign at any given step in the equation. 2 Solve for 𝑥 in the equation. (5 − 9)𝑥 − 5 = 3𝑥 − 26 F −21 G −3 H 3 J 21 TEKS 111.32 4 (A) find specific function values, simplify polynomial expressions, transform and solve equations, and factor as necessary in problem situations; (B) use the commutative, associative, and distributive properties to simplify algebraic expressions. Rationale: Students should use the order of operations in order to first expand, then simplify the like terms. If students get the wrong sign at the first step, students will obtain -21 (F) or 21 (J) as their answer. We chose -3 (G) to be a distracter for the students because it will cause the students to check their work to ensure they find the correct answer. 3 Sara leaves her house driving 35 miles per hour. Brad leaves the same house driving in the same direction 15 minutes later driving 50 miles per hour. How long does it take for Brad to catch up with Sara? A 1 hour B 1 hour and 30 minutes Page 2 Name ____________________ Date _______________ Subject ________ Chapter Exam Solving Linear Equations C 2 hours G $75.65 D 2 hours and 30 minutes H $80.00 TEKS 111.32 3 (A) use symbols to represent unknowns and variables 4 (A) find specific function values, simplify polynomial expressions, transform and solve equations, and factor as necessary in problem situations; (B) use the commutative, associative, and distributive properties to simplify algebraic expressions. 7 (A) analyze situations involving linear functions and formulate linear equations or inequalities to solve problems. Rationale: This problem requires students to create an equation involving one variable. Students should create an equation that resembles 35𝑡 + 15 = 50𝑡. The answer choices (B, C, D) are all logical choices because these are answers a student might come up with if they were to simply give estimate rather than do the math needed for the problem. The distances are all reasonable options for the small difference in speed and the small head start of Sara. 4 Mr. Jones needs a new pair of jeans. The jeans he wants cost $89.00. They are on sale for 15% off. How much will Mr. Jones pay for his new jeans? J $87.67 TEKS 111.32 3 (A) use symbols to represent unknowns and variables 4 (A) find specific function values, simplify polynomial expressions, transform and solve equations, and factor as necessary in problem situations; (B) use the commutative, associative, and distributive properties to simplify algebraic expressions. 7 (A) analyze situations involving linear functions and formulate linear equations or inequalities to solve problems. Rationale: Students must create an equation from these clues. If the student fails to convert the percentage correctly, the other answers ( G, H, J) may be found. 5 Solve for 𝑧 in the following equation. 50𝑧 + 26𝑦 = 12𝑧 + 38 F 19−13𝑦 G 19−7𝑦 19 25 H 1 − 13𝑦 J 38𝑧 + 26𝑦 − 38 F $70.00 Page 3 Name ____________________ Date _______________ Subject ________ Chapter Exam Solving Linear Equations TEKS 111.32 4 (A) find specific function values, simplify polynomial expressions, transform and solve equations, and factor as necessary in problem situations; (B) use the commutative, associative, and distributive properties to simplify algebraic expressions. Rationale: Students must first decide what they are looking for. Answer choice J has the same value as the original equation, however, the student is asked to solve for z. Answer choices G and H are answers a student would choose if the student incorrectly simplified the equation after isolating the variable. situations; (B) use the commutative, associative, and distributive properties to simplify algebraic expressions. Rationale: This question tests the student’s ability to critically read a math problem and translate it into an equation. Each answer choice involves just one mistake in the reading of the problem. If students know the equation for the total surface area of a cylinder, they will have an advantage. However, not many students memorize their formula chart. 7 Simplify the following equation. 3(𝑥 − 2) − 4(𝑦 − 6) = −27 6 The total surface area of a cylinder is described as being “two times Pi times the radius, all multiplied by the sum of the height and the radius.” Which is the equivalent equation? A 2𝜋𝑟ℎ + 𝑟 B 2𝜋𝑟 2 + ℎ C 2𝜋𝑟 2 ℎ D 2𝜋𝑟(ℎ + 𝑟) TEKS 111.32 3 (A) use symbols to represent unknowns and variables 4 (A) find specific function values, simplify polynomial expressions, transform and solve equations, and factor as necessary in problem A 3𝑥 + 4𝑦 = −3 B 3𝑥 + 4𝑦 = −45 C 3𝑥 − 4𝑦 = 3 D 3𝑥 − 4𝑦 = −45 TEKS 111.32 4 (A) find specific function values, simplify polynomial expressions, transform and solve equations, and factor as necessary in problem situations (B) use the commutative, associative, and distributive properties to simplify algebraic expressions. Rationale: This question tests the knowledge of the order of operations. While D is the correct answer, the Page 4 Name ____________________ Date _______________ Subject ________ Chapter Exam Solving Linear Equations other answers (A, B, C) are answers that students will arrive at if they change the sign or forget to change a sign when simplifying the equation. 8 The area of a rectangle is 127.365. The width of the rectangle is 5.0946. What is the length of the rectangle? F 5 G 11.286 H 25 J 58.5879 TEKS 111.32 3 (A) use symbols to represent unknowns and variables 4 (A) find specific function values, simplify polynomial expressions, transform and solve equations, and factor as necessary in problem situations (B) use the commutative, associative, and distributive properties to simplify algebraic expressions. Rationale: Students should know the equation to find the area of a rectangle. If they know that the width is always smaller than the length, the student should be able to rule out F automatically. If the student uses the square root of 127.365 the student will find G as the answer. Answer choice J is the answer a student will find if the perimeter rather than the area is used to find the length of the rectangle. Page 5 Name ____________________ Date _______________ Subject ________ Chapter Exam Solving Linear Equations Part III Short Answer (7 Points Each) DIRECTIONS Answer the following word problems. Make sure to show every step and simplify to the simplest form. 9 Mrs. Clark is buying a new TV. The TV costs $499.00 but is getting $100.00 off for paying cash. After $100.00 is subtracted, the tax is 8%. How much is Mrs. Clark paying for her new TV? TEKS 111.32 4 (A) find specific function values, simplify polynomial expressions, transform and solve equations, and factor as necessary in problem situations (B) use the commutative, associative, and distributive properties to simplify algebraic expressions. [($499.00 − $100.00) − 10 Suzy, Tommy, and John all have a set number of folders. The three have a total of 34 folders. Tommy has twice as many folders as John and Suzy has two less than three times as many folders as John. How many folders does Tommy have? TEKS 111.32 3 (A) use symbols to represent unknowns and variables 4 (A) find specific function values, simplify polynomial expressions, transform and solve equations, and factor as necessary in problem situations (B) use the commutative, associative, and distributive properties to simplify algebraic expressions. ($499.00 − $100.00) ∗ 8%] $399.00 − ($399.00 ∗ .08) $399.00 − $31.92 $367.08 𝑥 + 2𝑥 + (3𝑥 − 2) = 34 6𝑥 − 2 = 34 6𝑥 = 36 𝑥=6 Page 6 Name ____________________ Date _______________ Subject ________ Chapter Exam Solving Linear Equations But x is how many John has. Tommy has 2x folders so we have to substitute 6 for x. So Tommy has 12 folders. Page 7 Name ____________________ Date _______________ Subject ________ Chapter Exam Solving Linear Equations Part IV Essay (10 Points) DIRECTIONS Answer the following essay question. Your response should be at least a paragraph. 11 Why is it important to know the order of operations when solving linear equations? Be sure to include the order of operations and an example of when the order of operations must be used to obtain the correct answer. TEKS 111.32 (1) Foundation concepts for high school mathematics. As presented in Grades K-8, the basic understandings of number, operation, and quantitative reasoning; patterns, relationships, and algebraic thinking; geometry; measurement; and probability and statistics are essential foundations for all work in high school mathematics. Students will continue to build on this foundation as they expand their understanding through other mathematical experiences. (2) Algebraic thinking and symbolic reasoning. Symbolic reasoning plays a critical role in algebra; symbols provide powerful ways to represent mathematical situations and to express generalizations. Students use symbols in a variety of ways to study relationships among quantities. (6) Underlying mathematical processes. Many processes underlie all content areas in mathematics. As they do mathematics, students continually use problem-solving, language and communication, and reasoning (justification and proof) to make connections within and outside mathematics. Students also use multiple representations, technology, applications and modeling, and numerical fluency in problem-solving contexts. Example Response: First in the order of operation is parenthesis and exponents. Next, is multiplication and division followed by addition and subtraction. If you do not know the order of operations, you will not get the correct answer. For instance, if you have a parenthesis and you do not perform the operation inside first and do not use the Distributive Property, you will combine numbers or terms that should not be combined. This does change the outcome. One example would be (5 − 4) ∗ 2. When done correctly the student gets 2 as an answer. If doing multiplication first, the student may get 5 − 8 and therefore have −3 as the answer. In the end, we see that knowing the order of operations is imperative when solving a linear equation. Page 8