straight line 1:ax+B₁y+C₁=0, straight line 2: a₂x+B₂y+C₂=0, then the method for finding the intersection of two straight lines is:

x=(B₁C₂-B₂C₁)/(B₂A-B₁A₂) y=(AC₂-C₁A₂)/(B₁A₂-AB₂)