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# help

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$$\begin{cases} x + 2y + 3z = 10 \\ 3x + 6y + 10z = 31 \\ 5x +11y + 15z = 52\end{cases}$$

Determine the value of x + y - z.

Jul 8, 2020

#1
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Multiply first equatin by   -3      then add to second equation to solve for z     as a start......

then   multiply first equation by -5      and add to third equation  to solve for   y

then use the values of   z   and  y   that you have found in any of the equations to solve for  x

Jul 8, 2020