What is the simplified form of this expression? (-3x^2+x+5) - (4x^2x)
a. x^2-x+5
b. 7x^2+3x-5
c. -7x^2+3x+5
d. -x^2+3x-11

I think it is C.

Step-by-step explanation:

This was really difficult to figure out.

C. just seemed like the better option.

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