Question

solve 4x-4y=-16,
x-2y=-12
by using substitution. Express your answer as an ordered pair.

Answer 1

x=-12+2y..(1)
sub to 4x-4y=-16
4(-12+2y)-4y=-16
-48+8y-16y=-16
-8y=32
y=-4

sub to (1)
x=-12-8=-20