What must be true about the solution to this system of equations?

Question

x+4y+9z = -96
-2y+9z = -47
z = -7

a) The solution will describe the intersection point(s) of the 3 graphs.

b) The value of z must be -7.

c) The solutions will have values for x, y, and z.

d) All of the above statements are true.

I initially chose D.

Answer 1

I agree with D.