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5x+2y=-4 |×2
_____________
2x+4y=8
10x+4y=-8
_________ -
-8x=16
x=16/-8
x=-2
2x+4y=8
2(-2)+4y=8
-4+4y = 8
4y = 8+4
4y = 12
y = 12/4
y=3
jadi, HPnya = {x,y}
{-2,3}
3x+2y=12 |×1
2x-y=8 |×2
_____________
3x+2y=12
4x-2y=16
_________ +
7y=28
y=28/7
y=4
3x+2y=12
3x+2(4)=12
3x+8=12
3x=12-8
3x=4
x=4/3
jadi, HPnya = {x,y}
{4/3,4}