List three pairs that are equivalent

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 multiplys to be 1 but adds up to be 4

Isaac wants the equation below to have no solution when the missing number is placed in the box. which number should he place in the box?