Question

(2, -1) is the solution to this system of equations.
-2y=x
2y=x-4

true or false?

Answer 1

true

Answer 2

PLUG (2, -1) BACK INTO THE SYSTEM OF EQUATIONS. IF IT IS TRUE FOR BOTH THEN YES IT IS A SOLTUTION.

Answer 3

(2, -1)

-2y=x
2y=x-4

-2(-1) = 2
2(-1) = 2-4

2 = 2
-2 = 2-4

2 = 2 -----> TRUE
-2 = -2 -------> TRUE