Question

Use substitution to solve the system of equations.
2x+y=-7
-5x+2y=22
A. (–36, 65) B. (–4, 1) C. (8, –23) D. (36, –79)

Answer 1

if you really dont know how to do this, you can always do it the long way by plugging in x and y from each answer and seeing if it works

Answer 2

http://www.khanacademy.org/math/algebra/systems-of-eq-and-ineq/v/substitution-method-2

Answer 3

-.-