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7th Grade PreAlgebra help?


Richard
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I need help. I forgot (somehow :oops: ) how to do this. Can someone help me?

This is the substitution method for linear equation. The answer must be an ordered pair. :D

13. x-y=5

x+2y=7

Could you give me step by step tips?

Thanks xD

:oops:

Sorry for all the trouble.

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If you want to solve by substitution, here is how you do it. You solve one of the equations for a variable (x or y). It doesn't matter which one. So, x-y=5 can become x=y+5. Then, you substitute the equation on the right side of that (y+5) for x in the other equation (since x now = y+5).

So x+2y=7 becomes (y+5) + 2y = 7. Find y in that equation (that's now the y of your ordered pair), it back into the first equation (x-y=5), and solve for x. You now have your ordered pair.

Lemme know if you need more clarification - I might not get back to you right away, but I'm sure some other folks on the forum are good at math too.

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