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2x - 5y = 9 x 2 => 4x - 10y = 18
dieliminasi maka 7y = - 21 => y = -3
nilai y dimasukkan kedalam persamaan 2x - 5(-3) = 9
2x = -6
x = -3
jadi x-y = 0
2x-5y=9 kali 2 4x-10y=18 -
7y = -21
y= -21/7
y = -3
2x-5.-3=9
2x+15 =9
2x = -6
x = -3
maka x=-3 dan y= -3
x-y = -3 -(-3)
= 0