Explanation- your supposed to pick two points to get your slope. I picked (-2,0) and (3,4). The slope formula is y2-y1/x2-x1. 0-4/-2-3 is what you'll get if you in the numbers correctly into the formula. The that will equal 4/5. Rise 4 which is on numerator and run is 5 which is on the denominator.
The scale factor is what u multiply the first image by to get the second image. So by dividing the second image by the first image will give u the scale factor.
6 / 1.5 = 4....so there is a scale factor of 4 because 1.5 * 4 = 6
