Not sure how I would solve this

How do you use the elimination method for this question? explain, because i really want to understand!

Which point is a solution to y s 4x + 5?

Use the formulas a = x 2 – y 2, b = 2xy, c = x 2 + y 2 to answer this question. one leg of a right triangle has length 11 and all sides are whole numbers. find the lengths of the other two sides. the other leg = a0 and the hypotenuse = a1