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4x - 3y - 3 = 0 ⇒ 4x - 3y = 3|×1| 4x - 3y = 3 -
-7y = 15
y = -15/7.
2x - 5y = 9
2x + 75/7 = 9
2x = -12/7
x = -6/7.
x² - 2xy + y² = (-6/7)² - 2(-6/7)(-15/7) + (-15/7)²
= 36/49 - 180/49 + 225/49
= 81/49.