1) {5x=y+50 y=5x-50 y=5x-50 y=5x-50 {-3.4x+2.6y=14 -3.4x+2.6*(5x-50) -3.4x+13x-130=14 9.6x-130=14
y=5x-50 y=5x-50 y=5*15-50 y=25
9.6x=144 x=15 x=15 x=15
1) {5x=y+50 y=5x-50 y=5x-50 y=5x-50
{-3.4x+2.6y=14 -3.4x+2.6*(5x-50) -3.4x+13x-130=14 9.6x-130=14
y=5x-50 y=5x-50 y=5*15-50 y=25
9.6x=144 x=15 x=15 x=15