Can someone please answer this

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.)

What term makes it inconsistent y=2x - 4 ?

Don't know how to find x given these segment lengths