Question

Using the rule y = 3x + 4, find the value of y when x is 2.

A) 9
B) 10
C) 11
D) 12

Using the rule y = 8x + 5, find the value of y when x is 6.
A) 19
B) 43
C) 50
D) 53

If y = 3x + 5, what is the value of y when x = 12?
A) 17
B) 20
C) 31
D) 41

Use substitution to determine whether the value for x is a solution for the equation.

3x + 10 = 25
x = 5
5x − 10 = 25
x = 6
6x − 18 = 6
x = 4
4x + 12 = 40
x = 7
8x + 12 = 28
x = 3

Answer 1

option B

option D

option D

Correct

incorrect

correct

correct

incorrect

Explanation:

1) y = 3x + 4 with x = 2

y = 3(2) + 4= 10 option B

2) y = 8x + 5 with x = 6

y = 8(6) + 5= 53 option D

3) y = 3x + 5 with x = 12

y = 3(12) + 5= 41 option D

Use substitution to determine whether the value for x is a solution for the equation

3x + 10 = 25 With x = 5

3(5) + 10 = 25 it is correct

5x − 10 = 25 With x = 6

5(6) − 10 = 25 it is not correct

6x − 18 = 6 With x = 4

6(4) − 18 = 6 it is correct

4x + 12 = 40 With x = 7

4(7) + 12 = 40 it is correct

8x + 12 = 28 With x = 3

8(3) + 12 = 28 it is not correct