Substitute to Solve Expressions

Which has a value of 10? (HINT: solve each one!)

• F

• G

• H

• J

Plugging in a number for a variable is called

• operation

• evaluation

• substitution

• solving

Substitute w=45 into 2(w-7) and find the value.

• 38

• 76

• 52

• 83

If x=5, which expression when solved has the greatest value?

• 2x+6

• 3x+2

• 4x-5

• 5x-10

What is the value of 2a - 3b + 6 when a = 2 and b = -5?

Mathematical Equivalence

ON

Evaluate 2x + 5y - 4 when x = 11 and y = 3

Mathematical Equivalence

ON

Mathematical Equivalence

ON

Evaluate 8.7j – 9.8k when j = 7 and k = 4.

Mathematical Equivalence

ON

Answer explanation

Evaluate 8.7j – 9.8k when j = 7 and k = 4.

First, substitute for j and k:

8.7(7) - 9.8(4) then multiply.

60.9 - 39.2 and finally subtract

21.7

Tags

CCSS.MATH.CONTENT.7.EE.B.4.a

Evaluate the expression. Let g = 3 h = 9

4g + 2h + 4

Mathematical Equivalence

ON

12x = 144

• x = 12

• x = 4

• x = 2

• x = 132