what does y2 y1x2 x1 mean. In the latter 1m ie. If its not what You are looking for type in the equation solver your own equation and let us solve it.
Check how easy it is and learn it for the future. You just type in linex1 y1 x2 y2. In the latter 1m ie.
1 st approach is the one that requires both coordinates of the two points to be given.
In the former the slope m ie. The starting point of the line is x1 y1 and the end point is x2 y2. Use the given points. Does not mean what.