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The triangle on the left has a perimeter of 14, the triangle on the right has a perimeter of 21. What are x and y? Show your steps. I could sit here and figure it out by guessing and substituting, but I'm assuming there is a formula to this, so help?

Mathematics
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1 Attachment
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do u know how to solve this system of equation?

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Other answers:

With Elimination, Substitution, Matrices etc?
yea
Okay!
Actually wait, I can't seem to solve it.
|dw:1355368786620:dw|
|dw:1355368845228:dw|
and plug that into any equation to solve for x

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