Select one to be x1 y1 and the other to be x2 y2. Instead of 5 steps you can find the lines equation in 3 steps 2 of which are very easy and require nothing more than substitution. You can also use this method if you are given two points on the line without having the line graphed in front of you.
A vertical line has an undefined slope since it would result.
If youre seeing this message it means were having trouble loading external resources on our website. A line has a constant slope and is horizontal when m 0. Lets say that points 15 8 and 10 7 are on a straight line. The slopes called direction cosines on the x y x z and y z planes are then.