Solve this for points please..

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.)

Write two subtraction equations that are equivalent to 5 + 12 = 17.

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*