3 and 4 .Determinants and Matrices
easy

$x,y$ ની જે કિંમતો માટે શ્રેણિક જોડ $\left[\begin{array}{cc}3 x+7 & 5 \\ y+1 & 2-3 x\end{array}\right]=\left[\begin{array}{cc}0 & y-2 \\ 8 & 4\end{array}\right]$ સમાન થાય તેવી આપેલી $x $ અને $y$ ની કિંમત ............

A

$x=\frac{-1}{3}$,  $y=7$

B

$x=\frac{-1}{3}$,  $y=\frac{-2}{3}$

C

$y=7$,  $x=\frac{-2}{3}$

D

શકય નથી 

Solution

It is given that $\left[\begin{array}{cc}3 x+7 & 5 \\ y+1 & 2-3 x\end{array}\right]=\left[\begin{array}{cc}0 & y-2 \\ 8 & 4\end{array}\right]$

Equating the corresponding elements, we get:

$3 x+7=0 \Rightarrow x=-\frac{7}{3}$

$5=y-2 \Rightarrow y=7$

$y+1=8 \Rightarrow y=7$

$2-3 x=4 \Rightarrow x=-\frac{2}{3}$

We find that on comparing the corresponding elements of the two matrices, we get two different values of $x$, which is not possible.

Hence, it is not possible to find the values of $\mathrm{x}$ and $\mathrm{y}$ for which the given matrices are equal.

Standard 12
Mathematics

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