Determine which equation below has a solution of x = 2. A. X + 9 = 14 - 3x
B. -4x + 3 = 8x - 21
C. 3x - 6 = 2x + 4
D. 18x - 32 = -23x – 6

answer is B

Step-by-step explanation:

first you subtract 8x from -4x to get -12x. Then you add the rest on -12x+3=-21. Subtract 3 from both sides.

-21-3=-24 -24 divided by -12= 2

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18