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-x+2y=1
-x+2y=1
-x+2(4-3x)=1
-x+8-6x=1
-x-6x=1+6
-7x=7
x=-1
x=1=>y=4-3x
y=4-3.1
y=4-3
y=1
HP={1,1}
3) 2x-3y=11 dan 3x+y=0
2x-3y=11
3x+y=0 ==>y=0-3x
2x-3y=11
2x-3(0-3x)=11
2x-0+9x=11
2x+9=11
11x=11
x=1
x=1 ==>y=0-3x
y=0-3.1
y=0-3
y=-3
HP={1,-3}
aaf kalau salah