slope of a line

types of line

there are four types of lines. positive, negative, 0 slope, and an undefined slope.

positive slope

a positive slope is going in a upward slope from left to right.

negative slope

a negative slope is going in a up or down slope from right to left

a slope=0

a slope that is = to 0 is a slope that is horizontal.
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undefined

a undefined slope is a slope that is vertical and has no solution.
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slopes in the real world