Substitute Numbers for Variables in Algebraic Expressions

If there is not a number in front of a variable, it is understood to be ....

• 1

• 0

• -1

• 5

Solve this expression. 2x - 3y

x=7 and y =4

• 12

• -7

• 2

• -2

Solve this expression. (pemdas)

r/7(a - b²)

r=49 a=15 b=3

• 42

• 27

• 48

• 6

An __________________ contains numbers, operations and one or more variables.

• algebraic expression

• equation

• expression

• term

Mathematical Equivalence

ON

Evaluate each expressions when x=2.

Then match the expression to the correct answer.

• 10

• 5x

• 12

• 3x - 1

• 5

• x + 7

• 9

• 14 - x

• 4

• 8 / x

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

Mathematical Equivalence

ON

Mathematical Equivalence

OFF

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

Mathematical Equivalence

ON