Answer:
Slope
A line is increasing if it goes up from left to right. The slope is positive, i.e. m > 0 {\display style m>0} .
A line is decreasing if it goes down from left to right. The slope is negative, i.e. m < 0 {\display style m<0} .
If a line is horizontal the slope is zero. This is a constant function.
If a line is vertical the slope is undefined (see below).
Explanation:
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