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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. $\text{k} = 2$