Question

sistema linear

2m-n=4
m+2b=7


então a divisão m/n é?
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Answer 1

Resposta:

$2m-n=4\\\\2m-n+n=4+n\\\\2m=4+n\\\\\frac{2m}{2}=\frac{4}{2}+\frac{n}{2}\\\\m=\frac{4+n}{2}$

$m+2b=7\\\\m+2b-m=7-m\\\\2b=7-m\\\\\frac{2b}{2}=\frac{7}{2}-\frac{m}{2}\\\\b=\frac{7-m}{2}$