Inclined type: y=kx+b

Interception formula: x/a+y/b= 1.

Two-point formula: (x-x1)/(x2-x1) = (y-y1)/(y2-y1)

General formula: ax+by+c=0.

As long as we know the coordinates of two points and substitute them into any formula, we can find out the equation of a straight line.