Question

If the vectors $3\mathbf{i} + 2\mathbf{j} - \mathbf{k}$and $6\mathbf{i} - 4x\mathbf{j} + y\mathbf{k}$ are parallel, then the value of x and y will be

• A. – 1, – 2
• B. 1, – 2
• C. – 1, 2
• D. 1, 2

Answer 1

Answer: (A)

– 1, – 2

Answer 2

Obviously, $\frac{3}{6} = \frac{2}{- 4x} = - \frac{1}{y} \Rightarrow x = - 1$ and $y = - 2.$