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What is the value of y, in terms of x, if x + y = 15?

Algebra
Tutor: None Selected Time limit: 0 Hours

having some troubles

Apr 26th, 2015

So in order to do this problem, we want to get y by itself.  So right now, the y has x being added to it.  In order to "undo" the addition, we need to subtract something from both sides that leaves us with just y on the left.  

So we do:

x+y=15

-x+x+y=-x+15

y=-x+15 OR y=15-x

The answers are the same, just two ways to write them.


Please let me know if you have any questions! :)

Apr 26th, 2015

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Apr 26th, 2015
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Apr 26th, 2015
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