Question

For the following system, if you isolated x in the first equation to use the Substitution Method, what expression would you substitute into the second equation?

−x + 2y = 9
4x + 5y = 9

−9 + 2y

−9 − 2y

9 − 2y

9 + 2y

Answer 1

-x+2y=9
-x=9-2y
x=2y-9 or x=-9+2y, so the first option :D

Answer 2

thank you