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Wanna learn how to do this?

x + y = 21
5x + 2y = 72

yes!!!!

okay got that so far.

So we have,
5x + 2y = 72

Finally two equations,
x + y = 21
5x + 2y = 72

http://www.youtube.com/watch?v=hJOqGkWElNs

http://www.youtube.com/watch?v=Y6JsEja15Vk

I am sure those will help!

thanks

Welcome.