in Quantitative Aptitude edited ago by
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CAT2020-3-54

Let $\text{k}$ be a constant. The equations $\text{kx + y} = 3$ and $\text{4x + ky} = 4$ have a unique solution if and only if 

  1. $|\text{k}| \neq 2$
  2. $|\text{k}| = 2$
  3. $\text{k} \neq 2$
  4. $\text{k} = 2$
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