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2x-2y=8
3y=-6
y=-2
2x-2=2
2x=4
x=2
jadi x=2 dan y=-2
x-y=4 ---------------> x=y+4 sub ke 2x+y=2
2(y+4)+y=2
2y+8+y=2
3y+8=2
3y=-6
y=-2
semoga membantu :)