Question

I need help solving a system by substitution.
Please don't just give answers.

Answer 1

usually, with 3 variables, I find elimination less confusing. But in this case, notice the last equation let's you solve for x in terms of z

as a first step, can you solve for x, using the 3rd equation ?

Answer 2

Too bad you are required to use substitution... That makes things way harder. Elimination would be better. Cramer's Rule is the best!
Sorry to interrupt guys. :(

Answer 3

Divide both sides of the third equation by -2.
Replace -x and -z in the first equation with the result and then solve for y.

Answer 4

2x+2z=4
___________
-1-y--1=-8
----------
is y 8??

Answer 5

No.