In order to solve this one, you don’t actually have
to know the values of t and r. The easiest way to do this is by drawing
the line segment PQ. Because the slope is positive and the slope
equals rise over run , you know that t must be greater than r. Plot
the points, then draw a right triangle down from the line segment.
You know the proportion of the vertical leg of the triangle to the horizontal
leg is 2:1 because of the slope. Subtract the x values ( 5 – 2) to
get the total run distance (3). If the run distance is 3, the rise
distance should be twice that because of the slope, so it is 6. So
6 (E) is the difference between t and r.