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A horizontal line has a slope of 0, so not this answer.

A vertical line has an undefined slope, so not this too.

A line that rises from left to right does have a positive slope, so this is correct.

A line that falls from right to left is the same as rising left to right, so this has a positive slope. A negative slope falls from right to left, so not this answer.

A line that rises from left to right has a positive slope.

This answer is correct, and you can prove this by creating a graph and making a positive slope. This allows you to verify it starts on the left, and rises as it goes to the right
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