Respostas

2013-09-08T12:41:18-03:00
 \left \{ {{4x-3y=5} \atop {3x+y=7(3)}} \right.=> \left \{ {{4x-3y=5} \atop {9x+3y=21}} \right.\\\\4x+9x=5+21\\13x=26\\x=\frac{26}{13}\\x=\boxed{\boxed{2}}\\\\4x-3y=5\\4*2-3y=5\\-3y=5-8\\3y=8-5\\3y=3\\y=\frac{3}{3}\\y=\boxed{\boxed{1}}
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