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2x+y=12 2x+y=12
3x-5y=31 6x-10y=62
10x+5y=60 6x+3y=36
-----------------+ ------------------ --
13x=91 -13y=26
x=7 y=-2
[x,y] = {7,-2}
2x+y=12
⇒6x-10y=62
6x+3y=36
(dieliminasi)
-13y=-26
y=2
(subtitusi)
2x+y=12
2x=12-y
2x=12-2
2x=10
x=5