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Dit : Hp untuk -2 < x < 2
Jawab :
8x + 4y = 12
x = 12 - 4y / 8
8 (12 - 4y / 8) + 4y = 12
12 + y = 12
y = 12 - 12
y = 1
Jika y = 1, maka :
8x + 4y = 12
8x + 4(1) = 12
8x + 4 = 12
8x = 12 - 4
8x = 8
x = 8/8
x = 1
sehingga y = 1, x = 1
Jadi, himpunan penyelesaian -2 < x < 2 adalah {1,1}