Answer
$$\begin{bmatrix} 3&-10&\vdots&15 \\ 5&4&\vdots &22\end{bmatrix}$$
Work Step by Step
In order to write a matrix that would solve a linear equation, we write the coefficients of each variable in their own column. Thus, we find:
$$\begin{bmatrix} 3&-10&\vdots&15 \\ 5&4&\vdots &22\end{bmatrix}$$
