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3x + 4y = 18 |x1
5x - 2y = 4 |x2
3x + 4y = 18
10x - 4y= 8
__________ +
13x = 26
x = 26 : 13
x = 2
Cara Substitusi
3x + 4y = 18
3.2 + 4y = 18
6 + 4y = 18
4y= 18 - 6
4y = 12
y = 12 : 4
y = 3