## College Algebra (6th Edition)

$X=\left[\begin{array}{ll} -8 & -8\\ 2 & -9\\ 8 & -4 \end{array}\right]$
Use the Properties of Matrix Addition (page 614) $X-B=A$ ... Add matrix B to both sides, ... $-B+B=0$, the zero matrix $X+0=A+B$ $X=A+B$ $X=\left[\begin{array}{ll} -3 & -7\\ 2 & -9\\ 5 & 0 \end{array}\right]+\left[\begin{array}{ll} -5 & -1\\ 0 & 0\\ 3 & -4 \end{array}\right]$ $X=\left[\begin{array}{ll} -8 & -8\\ 2 & -9\\ 8 & -4 \end{array}\right]$