Simply divide the difference in the y-coordinates, by the difference in the x-coordinates.
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For two points at (x1,y1) and (x2,y2), respectively, the rate of change is equal to the slope of the shortest possible line segment connecting the two points. This slope can be calculated by the following equation: m = (y2-y1)/(x2-x1)
No. If you have more than two points for a linear function any two points can be used to find the slope.
If you mean a topographic map, then you just divide the distance between two contour lines by the change in height between the two points
Call one point "Point 1" and the other "Point 2". (X1, Y1) are therefore the coordinates of "Point 1", and (X2, Y2) are the coordinates of "Point 2". Plug those values into this formula to get the slope of the line between those two points. m = slope (Y2-Y1)/(X2-X1)=m
you look at the line and see if there are any direct points on the line the slope formula