Solve the systems in Problems (27-38) by the addition method. (left{begin{array}{l}x+y=560 x-y=490end{array}ight.)
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Solve the systems in Problems \(27-38\) by the addition method.
\(\left\{\begin{array}{l}x+y=560 \\ x-y=490\end{array}ight.\)
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