Slope of a straight line on a Cartesian coordinated graph is 'rise over run' = y2-y1/x2-x1 = change in 'y'/change in 'x'
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Slope = (vertical change)/(horizontal change), commonly referred to as rise/run. If the graph is a straight line, then you can count squares or measure how much change in vertical, over a specified change in horizontal. If it is a curve, then you need to have a tangent line (a line that touches the curve at a specific point and has the same slope as the line), then you can determine the slope of that line using the method described, above.
A straight line with a positive slope on a position-time graph is the graph of an object that's moving in a straight line with constant speed.
A straight line on the Cartesian plane
It has no slope and is parallel to the x axis
The graph is a straight line. Its slope is the speed.