Can someone help me with this question? Giving Brainliest + 50 Points!

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 other information do you need to prove triangle dac=bca by asa

Solve the equation for b: a= (1/2)(b)(h)