Unit 2 Chapter 2 Section 4 Exploring Two Step Equations.notebook
October 21, 2015
Bellringer
Solve each equation. Show your work! 4 1
1) a ­ = 7 4
2) 6b = ­18
3) ­21 = n
2
4) ­5 + x = ­26
Jul 26­12:38 PM
1
Unit 2 Chapter 2 Section 4 Exploring Two Step Equations.notebook
October 21, 2015
Unit 2
Chapter 2 Section 4
Exploring Two-Step Equations
Objective: To write and evaluate expressions with two operations and to
solve two-step equations using number sense.
Two-step equation can help you solve everyday problems. You can use
number sense to solve some problems. Using inverse operations can help
you solve them.
Jun 6­8:17 PM
2
Unit 2 Chapter 2 Section 4 Exploring Two Step Equations.notebook
October 21, 2015
Examples:
Writing and Evaluating Expressions
1) Define a variable and write an algebraic expression for the phrase:
a) 10 plus $5 times the number of roses ordered
b) Evaluate the expression for 12 roses
b) A man is two years younger than three times his son's age
b) Evaluate the expression if the son's age is 13
Solving Using Number Sense
2) Solve 5g + 8 = 48 by using number sense.
__ + 8 = 48 What number added to 8 is 48?
5g = 40 What number times 5 is 40?
3) Solve each equation using number sense.
a) 3m + 9 = 21
b) 8d + 5 =45
c) 4y ­ 11 =33
Application:
4) Suppose you buy a jumbo lemonade for $1.50 and divide the cost of an order of chicken wings with two friends. Your share of the total bill is $5.50. Write and solve an equation to find the coset of the chicken wings.
5) During the first half of a game you scored 8 points. In the second half you made only 3­point baskets. You finished the game with 23 points. Write and solve an equation to find how many 3­point baskets you made.
Jun 10­10:28 AM
3
Unit 2 Chapter 2 Section 4 Exploring Two Step Equations.notebook
October 21, 2015
Closure
1) How does solving a two­step equation differ from solving a one­step equation?
2) Solve each equation by using number sense.
a) 10h + 14 = 84
k
b) + 20 = 31
3
3) Write an algebraic expression for each phrase.
a) Eight pounds less than five times the weight of a chicken
b) One foot more than 6 times your height in feet
Jun 10­11:18 AM
4
Unit 2 Chapter 2 Section 4 Exploring Two Step Equations.notebook
October 21, 2015
Homework
Practice Worksheet 2­4
Jun 10­11:25 AM
5