Chevere673 Chevere673

22-07-2014
Mathematics

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x+y=10 , x+z=20 , y+z=24, x+y+z=???
and why??

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Аноним Аноним

23-07-2014

[tex]+\left\{\begin{array}{ccc}x+y=10\\x+z=20\\y+z=24\end{array}\right\ \ \ \ \ add\ both\ sides\\----------\\2x+2y+2x=54\ \ \ \ |divide\ both\ sides\ by\ 2\\\\x+y+z=27[/tex]

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