PLSS HELP NEEDED ASAP

The chart below shows the distribution of weeds in yard

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.)

Which value would be a solution for x in the inequality 47-4x< 7