Substitute a Given Value in an Expression

A symbol, usually a letter, used to represent a number.

• expression

• variable

• quadrant

• order of operations

If a = 2 and b = -3 find:

4a - 2b

• 14

• 2

• -2

• -14

If a = 2 and b = -3 find:

2a + 3b

• 10

• -5

• 2

• 22

2n + 3 + n

if n=3

• 8

• 10

• 12

• None of the above

6a - 3d
when a = 1, d = 2

• 3

• 12

• 1

• 0

Mathematical Equivalence

OFF

4(f-5)

if f=7

• 2

• 6

• 20

• 8

8y + 12 - 2z
for y = 4 and z = 2

• 40

• 20

• 84

• 34

Evaluate each expressions when x=2.

Then match the expression to the correct answer.

• 9

• 5x

• 4

• 8 / x

• 10

• 14 - x

• 5

• 3x - 1

• 12

• x + 7

b² + 4
when b = 3

• 10

• 12

• 13

• 11