If $\begin{bmatrix} x + 2 & 5 \\ 6 & y - 1 \end{bmatrix} = \begin{bmatrix} 7 & 5 \\ 6 & 3 \end{bmatrix}$, what is $x + y$?

Explanation

1. 01

   Equal matrices have equal corresponding elements: $x + 2 = 7$ and $y - 1 = 3$.

2. 02

   So $x = 5$, $y = 4$ and $x + y = 9$.