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Help with system equations

label Algebra
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Need help with subsituition 

Oct 21st, 2017

I'm happy to help. Show me some examples that you need help with.

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Apr 6th, 2015

Here is an example 

x+2y=13     y=2x+5

Apr 6th, 2015

plug y = 2x + 5 into the first equation

x + 2(2x+5) = 13

x + 4x + 10 = 13

5x = 3

x = 3/5

Apr 6th, 2015

Okay I understand the first part now! :) 

But what would you do for the second one.....

Apr 6th, 2015

That was it. You use the second equation to solve for both. x = 3/5 is the solution for both

Apr 6th, 2015

Thank you for your help Mr.Vincent :)

Apr 6th, 2015

You're most welcome :)

Apr 6th, 2015

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Oct 21st, 2017
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