y = x
y = 4/x
x = 4/x
x² = 4
x1 = 2 ,y1 = 2 .
x2 = - 2 ,y2 = - 2 .
即,函数y=x与y=4/x的图像交点坐标是 A(2 ,2) 和 B(- 2 ,- 2) .