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I have one example here                                                                                      1. Find the equation of the line which passes through the points (5,1) and has a slope of .5. In this case the slope and one set of coordinates are known.  This case involves the use of the point-slope formula.            The point-slope formula             y    =  y+ b (x - x1)             y    =  1  +  .5(x-5)             y    =  1  + .5x – 2.5             y    =  -1.5 + .5x