<P> Slope is calculated by finding the ratio of the "vertical change" to the "horizontal change" between (any) two distinct points on a line . Sometimes the ratio is expressed as a quotient ("rise over run"), giving the same number for every two distinct points on the same line . A line that is decreasing has a negative "rise". The line may be practical - as set by a road surveyor, or in a diagram that models a road or a roof either as a description or as a plan . </P> <P> The steepness, incline, or grade of a line is measured by the absolute value of the slope . A slope with a greater absolute value indicates a steeper line . The direction of a line is either increasing, decreasing, horizontal or vertical . </P> <Ul> <Li> A line is increasing if it goes up from left to right . The slope is positive, i.e. m> 0 (\ displaystyle m> 0). </Li> <Li> A line is decreasing if it goes down from left to right . The slope is negative, i.e. m <0 (\ displaystyle m <0). </Li> <Li> If a line is horizontal the slope is zero . This is a constant function . </Li> <Li> If a line is vertical the slope is undefined (see below). </Li> </Ul> <Li> A line is increasing if it goes up from left to right . The slope is positive, i.e. m> 0 (\ displaystyle m> 0). </Li>

What is the slope of the line defined by the equation y = 8
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