Choice A is the correct answer. Parallel lines have equal slopes.

1. Identify Slope: The slope of $y = 3x - 5$ is $3$.
2. Parallel Condition: $m_{parallel} = m_{original}$.
3. Result: $3$.

💡 Strategic Tip: Parallel means "same steepness, same direction".

Choice B is incorrect because sign change. Choice C is incorrect because reciprocal. Choice D is incorrect because negative reciprocal (perpendicular).