Dr. Steve's SAT Math Problem Thread for the Revised SAT

[DrSteve]

Level 4 Heart of Algebra:

2x + y = 7 – 2y
5y – x = 5 – 4x

If (*x*,*y*) is a solution to the above system of equations, what is the value of (*y*+1)/*x* ? 

(A) -11
(B) -1/2
(C) 2
(D) 20