Himpunan penyelesaian sistem persamaan 2x+3y=19danx-y=-8adalah x,ynilaix-7y

2x+3y=19. || 1 || 2x+3y=19
x-y =-8. || 2 || 2x-2y=-16

5y=35
y=7

x-y=-8
x-7=-8
x=-1

x-7y=
(-1)-7(7)
-1-49=-50