Mathematics · 2014
JEE Main · 12 April 2014, Shift 1 · Q65
If A= [1, 2, x; 3, -1, 2] and B= [y; x; 1] be such that AB = [6; 8], then:
If $\displaystyle A=\left[\begin{array}{lll}1 & 2 & x \\ 3 & -1 & 2\end{array}\right]$ and $\displaystyle B=\left[\begin{array}{l}y \\ x \\ 1\end{array}\right]$ be such that $\displaystyle \mathrm{AB}=\left[\begin{array}{l}6 \\ 8\end{array}\right]$, then :
Official answer
(1)
$\displaystyle y=2 x$
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JEE Main 2014 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.