21 — Sistema de Equação de 1° Grau.

Resolva os seguintes sistemas:

[tex]a) \: \begin{gathered} \left\{\large\begin{array}{lr}\tt \underline{ \: \: \: \: \: x \: \: \: - \: \: y \: = \: 1 \: \: \: \: \: \: \: \: } \\\tt - \: x \: + \: 2y \: = \: 3 \end{array}\right\} \end{gathered}[/tex]
[tex]b) \: \begin{gathered} \left\{\large\begin{array}{lr}\tt \: \underline{ \: \: \: \: \: \: \: \: x \: = \: 3y \: \: \: \: \: \: \: \: \: \: \: }\\\tt \: \: \: \: \: x \: - \: 2y \: = \: 3\end{array}\right\} \end{gathered}[/tex]
[tex]c) \: \begin{gathered} \left\{\large\begin{array}{lr}\tt \: \underline{2x \: + \: y \: = \: - \: 3} \\\tt \: \: x \: + \: y \: = \: - \: 1\end{array}\right\} \end{gathered}[/tex]
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