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

question 124

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) \(\left[ \begin{array} { l }
• x \\
• y
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { - 9 } { 7 } \\
• \frac { - 3 } { 14 }
• \end{array} \right]\)