Need help plzz which equation

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

you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.

the answer is y < -3 or   y > 3

-3y > 7 + 2

-3 y > 9

y < -3

what i would say the best answer is a. 40.5