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Slopes and Types for lines

Lines with different slopes

The most intuitive way to describe a line is by its slope which tells us how steep the line is, whether it is slanted to the right or to the left, or whether the line is a horizontal or a vertical line. A line with a positive slope slants to the right, and the larger the slope, the steeper the line. A line with a negative slope slants to the left and, the larger the slope, the greater the steepness of the line. A horizontal line has no slant and therefore, has a slope of 0. The slope of a vertical line is undefined.
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