If $\begin{bmatrix} 4x & 5x-7\\4x & 2x+y \end{bmatrix} = \begin{bmatrix} x+6 & y\\7y-13 & 7 \end{bmatrix}$ then the value of $2x+ y$ is :

8 7 9 6

7

$\begin{bmatrix} 4x & 5x-7\\4x & 2x+y \end{bmatrix} = \begin{bmatrix} x+6 & y\\7y-13 & 7 \end{bmatrix}$ On comparison $4x = x+6$ so $3x=6⇒x=2$ $5x-7=y$ so $10-7=y$ $y=3$ $2x+y=4+3=7$