Question

use the substitution method to solve the system of equations . choose the correct ordered pairs x+y=5 y=7 A.(12,7) B.(-12,7) C. (-2,7) D.(2,7)

Answer 1

C

Explanation:

given y = 7 then substitute this value into the other equation and solve for x

x + 7 = 5 ( subtract 7 from both sides )

x = - 2

solution is (- 2, 7 ) → C