Please. 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

Question

Please.  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

anonymous · Answer

−9 + 2y

anonymous · Answer

Let's see substitution method
Isolate x in the first equation
−x + 2y = 9
Add x on both sides
2y = 9 + x
Subtract 9 on both sides
-9 + 2y =x
So A. −9 + 2y

anonymous · Answer

Ok I see where I messed up.  Thank you.