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

3x + y = 8
-x - 2y = -10

Question

For the following system, if you isolated x in the second equation to use the Substitution Method, what expression would you substitute into the first equation?

3x + y = 8
-x - 2y = -10

anonymous · Answer

kay all you have to do is just substitute one equation into the other. So just isolate any variable in one equation then substitute that into the second equation to solve for the other variable

anonymous · Answer

2y + 10?

anonymous · Answer

k so for this question isolate x or y in any equation. I choose to rearrange the second equation. 

Rearrange (2) 
-x - 2y = -10 
-x = 2y - 10  * multiply both sides by -1 
x = 10 - 2y 

substitute x = 10 - 2y into equation (1) and solve for y

anonymous · Answer

no i mean is 2y + 10 the answer to the question

anonymous · Answer

i dont get what ur saying......
answer to what question

anonymous · Answer

oh no the answer is wrong

anonymous · Answer

10 - 2y is what you would substitute

anonymous · Answer

so its -2y - 10?

anonymous · Answer

no its -2y + 10