WeBWorK Standalone Renderer

The vector $\left[\begin{array}{c} 12\cr 9\cr 9 \end{array}\right]$ is a linear combination of the vectors $\left[\begin{array}{c} -3\cr 5\cr -1 \end{array}\right]$ and $\left[\begin{array}{c} -8\cr -8\cr -8 \end{array}\right]$ if and only if the matrix equation $A\vec{x}=\vec{b}$ has a solution $\vec{x}$ , where

$A =$ $\left[\Rule{0pt}{3.6em}{0pt}\right.$ $\left]\Rule{0pt}{3.6em}{0pt}\right.$ and $\vec{b}$ $\left[\Rule{0pt}{3.6em}{0pt}\right.$ $\left]\Rule{0pt}{3.6em}{0pt}\right.$ .

You can earn partial credit on this problem.