A. 7/4 Rate of change is the same as slope, it is how the line has to go to get from the first to the second point. The slope function is y2-y1 / x2-x1. So we end up with 8-1/5-1 making 7/4
Let’s make an equation Let’s say x = amount of years after Smith = 8, mother = 42 3(8 + x) = 42 + x 24 + 3x = 42 + x 2x = 18, x = 9 Solution: after 9 years
