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2x-y=9 x1
2x+6y=2
2x-y=9 dikurangkan
7y=-7
y=-1
subs. y=-1 ke 2x-y=9
2x+1=9
2x=8
x=4
HP=(4,-1)
2... 2x-y=9
pers1 kalikan 2,
2x+6y=2
kemudian eliminasi nilai x hasilnya
7y=-7
y=-1
subs. nilai y ke pers. 1
x+3(-1)=1
x-3=1
x=4