Which bisector of the angle between the lines $x + 2y - 1 = 0$ and $2x - y - 1 = 0$ passes through the origin?
Step-by-Step Solution
Key Concept: Write the two bisector equations using $\frac{x + 2y - 1}{\sqrt{5}} = \pm \frac{2x - y - 1}{\sqrt{5}}$. For each bisector, check whether $(0, 0)$ satisfies it.
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Correct Answer: (2)