Expression with Substitution

six times the number of girls
Let g = number of girls

• 6 + g

• 6g

• g - 6

Define substitute.

• the number multiplied by a variable

• to replace a variable with a value or an expression

• a number standing alone

• to find the value of an expression

If a = 4 b = 6, what is 3a + 5b?

• 40

• 42

• 44

• 46

If x=5,find the value of 7x-1

• 34

• 36

• 35

If a=3, and b= -1, then (ab)² =

• -3

• -9

• 3

• 9

if x = 4,

calculate 2x + 5

• 9

• 13

• 13x

• 8x + 5

let x = 4 and y = 7,

Calculate x + 2y

• 15

• 4 + 14y

• 18

• x + 14

let x = 6 and y = 3,

calculate 3x - 4y

• 18x - 12y

• 6(x - y)

• 12

• 6

Solve 14 - cd when c = 2 and d = 7

• 0

• 28

• 16

• 23

take 10 away from s 

• 10 - s 

• s + 10

• s - 10

• s/10