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y−y1=m(x−x1)
In this point-slope equation, (x1,y1) represents a specific point on the line, and (x,y) represents any point also on the line. Graphically, this means that the line passes through the point (x1,y1).
It is worth mentioning that the point-slope form can only be written for non-vertical lines.
x2=x, y2=y
LHS⋅(x−x1)=RHS⋅(x−x1)
Rearrange equation