Just this question and an explanation

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

Consider the diagram. which line segment has the same measure as st? rx tx sr xs

15 ! figure 1 is dilated to get figure 2. what is the scale factor? enter your answer in box /