Page 52 - SPARK OF MATH book 6

(4-2) Evaluate Algebraic Expressions.

To evaluate an algebraic expression, substitute numbers for the

variables and then follow the order of operations.

Evaluate the expression (12+3y) when (y=2)

12+3y

=12+3 (2) (substitule 2 for y)

=12+6 (using order of operations)

=18

Evaluate the expression on for given value of the variable.

a) -9 when = 11 b) 2w+7 when w=10

2
c) p +5 when p= 6 d) 10-3f when f= 3

e) (15- ) ×2 when = 5 f) 6+g÷2 when g= 8

Your Work

a) Find the value of K that makes the expression (2k) less than 7.

Discuss your answer.

b) How much greater is the perimeter of a square with a side

length (6 cm) than a square with a side length of (5 cm)?

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