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x = 2y-5
x²+y² = 25
(2y-5)²+y² = 25
4y²-20y+25+y² = 25
5y²-20y = 0
y(5y-20) = 0
y=0 atau 5y-20=0
y=0 atau y=4
untuk y=0, x=2y-5 = 2(0)-5 = -5
titiknya (-5,0)
untuk y=4, x=2y-5 =2(4)-5 = 3
titknya (3,4)
HP: {(-5,0);(3,4)}