Question

I need help solving systems w/ 3 variables.
x - 5y + z = 3
x + 2y - 2z + -12
2x + 2z = 6
Need to see all steps on how to do this problem ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Answer 1

plug that equation into the variable z
so...
x-5y+z=3
turns into x-5y-x+3=3

the x cancels each other out, so you're left with
-5y=3
y=3/-5