straight line 1:a₁x+B₁y+C₁=0, straight line 2: a₂x+B₂y+C₂=0, then the method for finding the intersection of two straight lines is:

result: x=(b₁C₂-B₂C₁)/(B₂A₁-B₁A₂) y=(A₁C₂-C₁A₂)/(B₁A₂-A₁B₂)