How many lattice points (points with integer coordinates) are on the line segment whose endpoints are (3,17) and (48,281)? (Include both endpoints in your count.)
There are four points.
The slope of the line is (281-17)/(48-3) = 88/15, so for each 15 lattice points to the right of 3 you move up by 88 lattice points.
+367 
