y²=x,y=x²
x^4 = x
x(x³ - 1) = 0
所以x = 0,y = 0 或 x = 1,y = 1
y²=2x,y=x-4
x² - 8x + 16 = 2x
x² - 10x + 16 = 0
(x - 2)(x - 8) = 0
所以x = 2,y = -2 或 x = 8,y = 4