Substituting Variables

If x = 1, y = 3, and z = 2, what is the value of the expression 4xy + 3xz+ 7y?

• 46 

• 42

• 39

• 23

Substitute x= 3 into the expression 3x+1

• 3

• 9

• 10

• 7

• 5

• 25

•  10

• 20

If x+y=14 and x-y=4 then the values of x and y are_________

• x=4 and y = 5

• x = 9 and y = 7

• x = -6 and y = 5

• x = 9 and y = 5

A letter or symbol that represents an unknown value is called ______________.

• Variable

• Radicand

• Coefficient

• Constant

Pick the thing that we could use as a Variable

• 12

• 8

• 1

• k

If a = 6 and b = 7,find the value of 15-a-b.

• 2

• 3

• 4

• 5

6q +m - m when m =8 and q= 3

• 63

• 24

• 18

• 1

What is the value of x in x + 12 = 17?

• 2

• 5

• 6

• 3

What is the value of the expression, 9x² - 12x + 4, when x = 3?

• 22 

• 49

• 85

• 345