Substituting for One Variable

Substitute x= 3 into the expression 3x+1

• 3

• 9

• 10

• 7

• 5

• 25

•  10

• 20

Pick the thing that we could use as a Variable

• 12

• 8

• 1

• k

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

• 63

• 24

• 18

• 1

If x = -3, in the equation -2x + y = 15, what is y? Type in the number.

Which choice shows substitution correctly?

3x - y = 10

y = -6x + 3

• 3x - (-6x +3) = 10

• 3(-6x + 3) - y = 10

x = y - 2
4x + y = 2

• (2,0)

• (0,2)

• (0, -2)

• (-2,0)

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

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

• 46 

• 42

• 39

• 23