I dont understand this trash question. Pls help :( ill love you forever

Factor the polynomial by its greatest common monomial factor.

X-y=4 x+y=8 the x-coordnate of the solution to the system shows

Technical improvements catechnical improvements cause production costs to decline, which causes to increase and prices to decreased unemployment causes consumer incomes to use production costs to decline, which causes to increase and prices to decreased unemployment causes consumer incomes to