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3x+2y=17 |x2
2x-3y=-6 |x3
6x+ 4y=34
6x-9y=-18
dikurangkan -------> 13y=52
y=4
lalu subsitusikan ke pers salah satu
2x-3y=-6
2x-3(4)=-6
2x =6
x=3
2x - 3y = -6 | × 3
= 6x + 4y = 34
6x - 9y = -18
_________________ -
0 + 13y = 52
13y = 52
y = 52/13
y = 4
sub. y = 4 , pilih salah satu persamaan
2x - 3y = -6
2x - 3.4 = -6
2x - 12 = -6
2x = -6 + 12 ( 12 pindah ruas menjadi min )
2x = 6
x = 6/2
x = 3
jadi x = 3 dan y = 4