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If $\begin{bmatrix}2x & -7\\5y & 8\end{bmatrix}=\begin{bmatrix}6 & -7\\-5 & 3x+y\end{bmatrix}$ then value of $(5x+3y)$ is : |
16 12 15 10 |
12 |
The correct answer is Option (2) → 12 $\begin{bmatrix}2x & -7\\5y & 8\end{bmatrix}=\begin{bmatrix}6 & -7\\-5 & 3x+y\end{bmatrix}$ $2x=6;x=3$ $5y=-5;y=-1$ $∴5x+3y=5(3)+3(-1)=12$ |
