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4x + 3y = 17 |kali 3| 12x + 9y = 51
___________ -
-29y = 29
y = - 1
x = 5
4x+3y=17 kali 5
9x-15y=60
20x+15y=85
jumlahkan -15y dan 15y =0
9x+20x=60+85
29x=145
x = 145 : 29
x = 5
masukan x ke salah satu persamaan
4x+3y=17 (x=5)
4(5)+3y=17
20+3y=17 (20 pindah ruas)
3y=17-20
3y=-3
y=-1