anonnnn

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?

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anonnnn

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mandonut

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mandonut

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do u know how to solve this system of equation?

anonnnn

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With Elimination, Substitution, Matrices etc?

mandonut

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yea

anonnnn

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Okay!

anonnnn

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Actually wait, I can't seem to solve it.

mandonut

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mandonut

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mandonut

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and plug that into any equation to solve for x