If the vectors $\hat{i}+2 \hat{\jmath}+x \hat{k}$ and $y t+6 \hat{k}+4 \hat{k}$ are collinear, then the…
If the vectors $\hat{i}+2 \hat{\jmath}+x \hat{k}$ and $y t+6 \hat{k}+4 \hat{k}$ are collinear, then the values of $x$ and
$y$ are respectively,
- $\frac{4}{3}, 3$
- 3,4
- $\frac{1}{3}, 1$
- 4,3
Solution
Let $\bar{a} \& \bar{b}$ be given collinear vectors
$\begin{array}{l}
\therefore \overline{\mathrm{a}}=\mathrm{m} \overline{\mathrm{b}} \\
\therefore \quad \hat{\mathrm{i}}+2 \hat{\mathrm{j}}+\mathrm{x} \hat{\mathrm{k}}=\mathrm{m}(\mathrm{yi}+6 \hat{\mathrm{j}}+4 \hat{\mathrm{k}}) \\
\therefore \quad \hat{\mathrm{i}}+2 \hat{\mathrm{j}}+\mathrm{xk}=\mathrm{my} \hat{\mathrm{i}}+6 \mathrm{~m} \hat{\mathrm{j}}+4 \mathrm{mk} \\
\therefore \quad 1=\mathrm{my}, 2=6 \mathrm{~m}, \mathrm{x}=4 \mathrm{~m} \Rightarrow \mathrm{m}=\frac{1}{3}, \mathrm{y}=3, \mathrm{x}=\frac{4}{3}
\end{array}$
Asked in: MHT CET 2020 (13 Oct Shift 2)
Practice more Vectors questions on Aicharya