Combine the linear function and quadratic function into an equation, eliminate y to get a quadratic equation about x,

Using the relationship between root and coefficient to establish the relationship between coefficient and root, it is known that two straight lines are vertical.

The product of the slopes of two straight lines is-1, and the equations about x and y are listed.

By using the relationship between roots and coefficients, the equation is transformed into an analytical expression of a straight line, and then the fixed point through which it passes is judged.