Unit 2 Chapter 2 Section 1 Expressions Equations Inequalities.notebook
October 08, 2015
Bell Ringer: Copy these vocabulary words down in your new Chapter 2 Guided Notes!
Unit 2- Chapter 2 Section 1
Objective: To write and evaluate algebraic expressions
Variable: a symbol that represents 1 or more numbers
Algebraic Expression:
Evaluate:
a "math phrase" with at least 1 variable
to find the value of
Jun 6­8:17 PM
1
Unit 2 Chapter 2 Section 1 Expressions Equations Inequalities.notebook
October 08, 2015
Examples:
Writing algebraic expressions
Lets think of some words that describe the following math operations...
Add
Subtract
Multiply
Divide
Jun 10­10:28 AM
2
Unit 2 Chapter 2 Section 1 Expressions Equations Inequalities.notebook
October 08, 2015
Write a variable expression that represents each phrase. If necessary, choose a variable to represent the unknown number.
1) Five more than a number x
2) Twice as old as Lily
3) A dinner bill of d dollars divided among 5 friends
4) Twelve fewer apples on the tree than yesterday
Aug 30­1:10 PM
3
Unit 2 Chapter 2 Section 1 Expressions Equations Inequalities.notebook
October 08, 2015
Application: Writing Word Problems
5) The Environmental Club is making posters. The materials for each poster cost $4. Write an algebraic expression for the cost of p posters.
6) Nine students will hang t posters each. Write an algebraic expression for the total number of posters the students will hang.
Aug 30­1:10 PM
4
Unit 2 Chapter 2 Section 1 Expressions Equations Inequalities.notebook
October 08, 2015
Writing Word Phrases
7) Write two different word phrases for x + 2.
a) b)
Aug 30­1:10 PM
5
Unit 2 Chapter 2 Section 1 Expressions Equations Inequalities.notebook
October 08, 2015
Evaluating Algebraic Expressions
8) Evaluate each expression. Use the values p = ­2, n = 3 and s = 5
.
.
a) 2p + 7
b) p + (n s) c) (n p) ­ s
d) 15 ­ p
s
e) 8n + 2s
f) 6s ­ 3p
Oct 7­12:34 PM
6
Unit 2 Chapter 2 Section 1 Expressions Equations Inequalities.notebook
October 08, 2015
Oct 8­8:52 AM
7