Question

Find the value of x in 3x + 4y = 12 and 9x - 4y = 24.

A.-3
B.3
C.0.75
D.-0.75

Answer 1

D.0.75 like if this was right

Answer 2

B. x=3

Explanation:

3x+4y=12

9x-4y=24

Add 9x and 3x

Subtract -4y from 4y which will cancel out

Add 12 and 24

12x=36

divide both sides by 12

x=3