Ms. Garcia Math
Slope
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Is ratio of the "vertical change" to the "horizontal change" between two distinct points on a line.
To find the slope divide the rise (Δy) by the run (Δx)
Positive Slope (goes UP)
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As x increases, y increases
Negative Slope (goes DOWN)
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As x increases, y decreases
Zero Slope (horizontal line)
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y does not change as x increases
Undefined Slope (vertical line)
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For a vertical line the slope is undefined.
Parallel lines
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They have the same slope. The symbol to indicate parallel lines is two vertical bars ││.
Perpendicular lines
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They have have negative reciprocal slopes.
A line is perpendicular to another if they meet at 90 degrees.