(y2-y1)/(x2-x1)
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Another coordinate is needed to determine the slope of the line.
Two coordinates are needed to determine the slope of a straight line equation.
If you mean (-2, 5) then another coordinate is needed in order to determine the slope of the line
if y2-y1=m x2-x1
Slope is the angle compared with the horizontal, where the horizontal is 90° to the vertical, which can be measured with a plumb line. So, put a weight on a string, measure the angle of the string to the angle you are measuring, subtract 90° and that will give you the slope.