The slope of a line tells a person what the rate of change is for a certain amount of time. For instance, on a graph where distance is the X axis and time is the Y axis, the slope will tell the velocity, literally, distance/time.
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The graph of the equationy = 2x + any numberis a straight line with a slope of 2.
A straight line graph with negative slope slants downward from left to right.
It will be a horizontal line
The slope of a line can be determined by examining the graph; only one line through a point has a particular slope.
Nothing particular. The graph of y = x2, for example, changes slope at each point on the graph.