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