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pers I
x - y = 10
x^2 - y^2 = 9
(x-y)(x+y)= 9
10(x+y)=9
x + y = 9/10 ... pers 2
eliminasi x pada pers 1 dan 2
x - y = 10
x + y = 9/10
_________ -
-2y = -109/10
y = 109/20
pers I
x - y = 10
x - 109/20 = 10
x = 200/20 + 109/20 = 309/20
HP = {309/20 , 109/20}