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6x-y=15.......(2)
Eliminasi x dr persamaan (1)&(2)
4x+7y=-13 ×(6)
6x-y=15 ×(4)
24x+42y=-78
24x-4y=60 (dikurangi)
0+46y=-138
y=-3
Sibstitusikan y=-3 ke persamaan (1)
4x+7y=-13
4x+7(-3)=-13
4x-21=-13
4x=-13+21
4x=8
x=2
Nilai 3x+2y
=3(2)+2(-3)
=6-6
=0