How do you check: 14 + 18p =-220 when p is -13?

Ifigured out the question and i dont know what to put here

Plz determine whether the polynomial is a difference of squares and if it is, factor it. y2 – 196 is a difference of squares: (y + 14)2 is a difference of squares: (y – 14)2 is a difference of squares: (y + 14)(y – 14) is not a difference of squares

Find the solution of this system of equation -7x+y=-20 9x-3y=36