Can someone help me with two questions, using substitution and elimination?

Question

godlovesme · Answer

yesss :) substitution is my fav. ^.^ lol

anonymous · Answer

Thank you so much. My teacher wants me to give him step by step on the stupid verbal exam and I am clueless!! One second :)

anonymous · Answer

$$x-2y = -6$$
$$x + y = 6$$

godlovesme · Answer

np :) which one do  u wanna do first sub/ eli.?
i h8 writing the whole think :P

anonymous · Answer

Me too! & this one I was told it was easier to use substitution.

godlovesme · Answer

lol substitution is easier :) 
so let's solve for x or y using either equations which one do u prefer?

anonymous · Answer

y

godlovesme · Answer

well that's how substitution works u gotta solve for either variables for instance |dw:1422913449160:dw|
do u see what i did?

anonymous · Answer

Kinda.

anonymous · Answer

Oh yes!! You added it to one side and what you do to one side you have to do to both sooo you canceled it out on the left side of the equation and added to the opposite side? Which was leaving the x alone... I think. Lol

godlovesme · Answer

|dw:1422913613753:dw|

godlovesme · Answer

yes exactly :)

anonymous · Answer

Okay, perfect :) Now what's next?

godlovesme · Answer

|dw:1422913792924:dw|
confusing?

anonymous · Answer

A little bit!!

godlovesme · Answer

u see that we got x=  -6+2y right?

anonymous · Answer

Yes, I get it now. I am rewriting in so I think that is helping a little too.

godlovesme · Answer

okay awesome :)|dw:1422914155684:dw|

anonymous · Answer

That helped a lot!!

anonymous · Answer

Now for the other one.. Ummm Elimination!! BORING I hate this one the most

godlovesme · Answer

we are not done with substitution though lol :P

anonymous · Answer

$$y= 2^{-x}$$
and
$$y=5^{x+3}$$

anonymous · Answer

REALLY lol

anonymous · Answer

What's left?

godlovesme · Answer

ik we only have the y we need x too :P 
|dw:1422914590138:dw|