nice setup ....
from the 2nd: y = -5x - 17
from the 3rd: z = 3x + 13
sub those into the first:
-4x + 2(-5x - 17) - 3(3x + 13) = -4
-4x - 10x - 34 - 9x - 39 = -4
-23x = 69
x = -3
now sub that into y = -5x-17 to get the y
and into z = 3x+13 to get z
-4x+2y-3z=-4
5x+y=-17
3x-z=-13
1 answer