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3x - y = 15
x - 3y = 3
Ditanya :
x - 2y = ???
Diselesaikan :
x = 3y - 3
Maka,
3x - y = 15
3(3y - 3) = 15
9y - 9 = 15
9y = 15 + 9
y = 24/9
y = 2,6.
3x - y = 15
3x - 2,6 = 15
3x = 15 + 2,6
3x = 17,6
x = 17,6/3
x = 5,8 ≈ 6.
Maka,
x - 2y = 6 - 2(2,6)
<=> 6 - 5,2
<=> 0,8 ≈ 1
Maaf kalo salah :)
Semoga membantu :)