Ineed i dont remember how to do it

Can someone explain the elimination method to me for this problem?

2x - 20 = 32 20 - 3x = 8 6x - 8 = 16 -13 - 3x = -10

Which function can be used to model the monthly profit for x trinkets produced? f(x) = –4(x – 50)(x – 250) f(x) = (x – 50)(x – 250) f(x) = 28(x + 50)(x + 250) f(x) = (x + 50)(x + 250)