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x = 4 - 2y
Substitusikan,
Untuk y = 1
x = 4 - 2(1) = 2
Untuk y = 20/9
x = 4 - 2(20/9) = -4/9
Sehingga,
Solusi bulat : x = 2, y = 1
x² - y² = 2² - 1² = 4 - 1 = 3