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x-4y=-1. / ×1
________
-2x+4y=4
-4x+x=-1
_______ +
x=1
y=1.5
subtitusikan y
x+1=4y
x+1=4(½x+1)
x+1=2x+4
2x-x=1-4
x=-3
subtitusikan nilai x
4y=x+1
4y=-3+1
4y=-2
y=-2/4
y=-½
jadi x=-3 dan y=-½
HP={-3,-½}