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2X - Y= 9 |×1|
2X + 2Y= 12
2X - Y = 9_ _
3Y = 3
Y= 3/3
Y= 1
X + Y= 6
X + 1= 6
X= 6 - 1
X= 5
Jadi, niali X yang memenuhi adalah 5.
x = 6 - y
2x - y = 9
12 - 2y - y = 9
12 - 3y = 9
3y = 3
y = 1
x + y = 6
x + 1 = 6
x = 5
x = 5