​Solve the System of Linear Equations $$\left\{ \begin{array} { l } 4 x + 4 y = 3 \\8 x - 20 y = - 9\end{array} \right.$$

question 12

Multiple Choice

​Solve the system of linear equations $$\left\{ \begin{array} { l } 4 x + 4 y = 3 \\8 x - 20 y = - 9\end{array} \right.$$ using an inverse matrix.

• A)​ \[\left[ \begin{array} { l }
• x \\
• y
• \end{array} \right] = \left[ \begin{array} { l }
• \frac { 3 } { 14 } \\\\
• \frac { 15 } { 28 }
• \end{array} \right]\]
• B)​ \[\left[ \begin{array} { l }
• x \\
• y
• \end{array} \right] = \left[ \begin{array} { l }
• \frac { 9 } { 28 } \\\\
• \frac { 12 } { 7 }
• \end{array} \right]\]
• C)​ \[\left[ \begin{array} { l }
• x \\
• y
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { 9 } { 28 } \\\\
• \frac { - 3 } { 14 }
• \end{array} \right]\]
• D)​ \[\left[ \begin{array} { l }
• x \\
• y
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { 9 } { 7 } \\\\
• \frac { 15 } { 28 }
• \end{array} \right]\]
• E)​ \[\left[ \begin{array} { l }
• x \\
• y
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { - 9 } { 7 } \\\\
• \frac { - 3 } { 14 }
• \end{array} \right]\]

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