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2x + 3y = -4 (dikalikan 1)
3x - y = 5 (dikalikan 3)
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2x + 3y = -4
9x - 3y = 15 +
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11x = 11
x = 1
substitusi x = 1 ke 3x - y = 5
3 (1) - y = 5
3 - y = 5
y = -2
x^2 - y^2
= (1)^2 - (-2)^2
= 1 - 4
= -3 (e)