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2U - 3Y = 7 dikalikan 4
maka
8u - 4y = 12
8u - 12y = 28 _
8y = - 16
y = -16/8
y = -2
8u -4y = 12
8u - 4(-2) = 12
8u + 8 = 12
8u = 12-8
8u = 4
u = 4/8
u = 1/2
2x-3y =7 kali 2
12x-6y=18
4x-6y =14 ,kemudia n dikurang
8x=4
x=1/2 (kemudian x tbs disubsitusikan ke 4x-6y =14
4.1/2-6y =14
2-6y=14
-6y=14-2
-6y=12
y=-2