Question

. The expression 3x+1 is equal to 9 for a certain value of x. Which of the following is the value of the

expression 12x+4 for the same value of x?
(1) 18
(3) 36
(2) 28
(4) 112

Answer 1

(3) 36

Explanation:

3x + 1 = 9

Minus 1 from both sides.

3x = 8

Divide both sides by 3.

x = 2 2/3

Plug it in.

12 (2 2/3) + 4

32 + 4

36