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 = y1 + b (x - x1) y = 1 + .5(x-5) y = 1 + .5x – 2.5 y = -1.5 + .5x