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Verified answer
2x - 5y - 9 = 0 ...... (dikali 2)4x - 3y + 3 =0
maka
4x - 10y - 18=0
4x - 3y + 3 =0
--------------------- -
- 7y -21 =0
-7y = 21
y = 21/(-7)
y = - 3
y = -3 substitusi ke 2x - 5y -9=0
2x - 5(-3) -9=0
2x + 15 - 9=0
2x +6 =0
2x = -6
x = 6/(-2)
x = - 3
sehingga
x^2 - 2xy + y^2
=(-3)^2 - 2(-3)(-3) + (-3)^2
= 9 - 18 + 9
= 0