Learn about positive and negative slopes in linear equations with this Khan Academy video tutorial.

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A line that's flat has a slope of 0. If a line goes up as you move to the right, it has a positive slope. The steeper it is, the bigger the slope. If a line goes down as you move to the right, it has a negative slope. The steeper it is, the more negative the slope.

Review of x-intercepts and y-intercepts of lines, including definitions and examples.

Learn algebra with interactive lessons and practice problems on Khan Academy.

Proof that perpendicular lines have negative reciprocal slopes.

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I cant figure out why the slope formula for a negative slope doesnt work when x comes from negative and you pick the point where x is zero to calculate against, ex: