Question

8x+6y=174
2x+4y=66
Obs:Sistema de substituição

Answer 1

2x=66-4y -> x=66-4y/2 -> x=33-2y

8x+6y=174
8(33-2y)+6y=174
264-16y+6y=174
-16y+6y=174-264
-10y=-90 -> -10y=-90*(-1) -> 10y=90
y=90/10
y=9

2x=66-4y
2x=66-4.9
2x=66-36
x=66-36
x=30

S{30 ; 9}