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Verified answer
X² = 6x + 5y + 7y² = 5x + 6y + 7
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x² - y² = x - y
(x + y)(x - y) = x - y
x + y = 1
y = 1 - x
y² = 5x + 6y + 7
(1 - x)² = 5x + 6(1 - x) + 7
x² - 2x + 1 = 5x + 6 - 6x + 7
x² - x - 12 = 0
(x + 3)(x - 4) = 0
x = -3 atau x = 4
Utk x = -3
y = 1 - x
y = 1 - (-3)
y = 4
utk x = 4
y = 1 - 4
y = -3
Jadi
xy = (-3)(4)
xy = -12 (A)
Hasilnya akan Sama
kalau x nya 4 dan y nya -3
BTW, ini Soal Inten ya?