Question

solve the system by substitution

-x-y-z=-8
-4x+4y+5z=7
2x+2z=4

Please help, totally confused with this one.

Answer 1

solve for one of the variables in any question, then substitute your result into a second equation.

Answer 2

That is what I have tried and I get fractions for answers. Not sure if that is right. Thanks.

Answer 3

what did you get?

Answer 4

hm. well the answers should not be fractions. let's see

Answer 5

i'd solve for 'x' in equation 3, then substitute that value into both equations 1 and 2.