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3x-y=2
2x-y=-2
_______-
x=4
Kita eliminasi x
3x-y=2 |x2| 6x-2y=4
2x-y=-2 |x3| 6x-3y=-6
________-
y=10
HP={(4,10)}
3x+2y=5 (1)
2x+y=1 ⇔ y=1-2x (2)
Persamaan (2) kita substitusikan (1)
3x+2(1-2x)=5
⇔3x+2-4x=5
⇔-x=3
⇔x=-3 (4)
Persamaan (4) kita substitusikan (2)
y=1-2x ⇒ y=1-2(-3) ⇒ y=1+6 ⇒y=7
HP={(-3,7)}
Semangat!