Graph the line with y- intercept 7 & slope -4​

Lena reflected this figure across the x-axis. she writes the vertices of the image as a'(−2, 8), b'(−5, 6), c'(−8, 8), d'(−4, 2).

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14

How do you do the foil method with polynomials?