# If 1 2 3 12 x A é ù = ê ú ë û – and 1 y B x é ù ê ú = ê ú ê ú ë û be such that 6 AB 8 é ù = ê ú ë û , then:

Question:

If $A=\left[\begin{array}{ccc}1 & 2 & x \\ 3 & -1 & 2\end{array}\right]$ and $B=\left[\begin{array}{l}y \\ x \\ 1\end{array}\right]$ be such that $\mathrm{AB}=\left[\begin{array}{l}6 \\ 8\end{array}\right]$, then:

1. $y=2 x$

2. $y=-2 x$

3. $y=x$

4. $y=-x$

Correct Option: 1

JEE Main Previous Year 1 Question of JEE Main from Mathematics Inverse Trigonometric Functions chapter.
JEE Main Previous Year Online April 12, 2014

Solution:

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