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

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

anonymous · Answer

I'm sure you've tried it out on your own first, so what did you get so far?

jdoe0001 · Answer

so isolate "x" in the 1st one then :)
what does it give you?

anonymous · Answer

I got 9-2y

jdoe0001 · Answer

9-2y?   hmmm
what's 9-2y equals to?

jdoe0001 · Answer

when they say , isolate "x", it means positive "x", no " - x "   btw