For which values of $x$ and $y$ is $\begin{bmatrix} 2x + 1 & 4 \\ y & 3 \end{bmatrix} = \begin{bmatrix} 7 & 4 \\ -2 & 3 - x \end{bmatrix}$?

Explanation

1. 01

   The top-left elements give $2x + 1 = 7$, so $x = 3$.

2. 02

   The bottom-right elements give $3 = 3 - x$, so $x = 0$. One $x$ cannot be both, so the matrices are never equal.