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-y = 4 - 2x
y = -4 + 2x
Substitusi y= -4 + 2x ke 5x - y = 13
5x - y = 13
5x - (-4 + 2x ) = 13
5x + 4 - 2x = 13
3x = 13 - 4
3x = 9
x = 9/3
x = 3
substitusi x = 3 ke 5x - y = 13
5x - y = 13
5(3) - y = 13
15 - y = 13
-y = 13 - 15
-y = -2
y = 2