Answer:
The point-slope form of a line is y - y1 = m (x - x1)
If the coordinates you are given are something like (3,5) and (9,10), find the slope "m" by taking the difference in y over the difference in x, so (10-5)/(9-3) = 5/6
Next, just plug in the values for one of the points
y - y1 = m (x - x1)
y - 5 = (5/6) (x - 3)
y - 5 = 5/6x - 5/2
y = 5/6x + 5/2