If {bmatrix} x+y & 7 \\ 9 & x-y {bmatrix} = ...

CBSE Class 12 Math 2020 Outside Delhi Set 1 Solved Paper

Question : 12 of 36

Marks: +1, -0

\begin{bmatrix} x+y & 7 \\ 9 & x-y \end{bmatrix} = \begin{bmatrix} 2 & 7 \\ 9 & 4 \end{bmatrix}

, then

x \cdot y =

____

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