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2x + 5y = 5......(2) dikali 5
10x + 6y = 28
10x + 25y = 25
-19y = 3
y = -3/19
5x + 3.(-3/19) = 14
5x - 9/19 = 14
5x = 275/19
x = 55/19
x² - y² = (x + y) (x - y) = (55/19 - 3/19) (55/19 + 3/19) = 3016/361