The approach depends on what you are using to start. Let's begin with the graphic approach.
The second approach is used when you have an equation with a y with no exponent and x with no exponent in it (if either have exponents, the graph will not exhibit a global slope):
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If the points are: (4, 8) and (2, 4) Then the slope is: 8-4/4-2 = 4/2 = 2
The formula for finding the slope of the line is this: m = (Y2-Y1)/(X2-X1)
y = mx + b where m is the slope and b is the y-intercept.
The equation of slope intercept form is y=mx+b. This would be used in finding the slope of an object and is the most efficient way to date in doing so.
-- Measure how far the slope rises in 100-ft of horizontal distance.-- That number is the percent of slope, or the "grade".-- If you want the angle of the slope, divide the number by 100, and look upthe "arctangent" of the answer in a table or on a calculator.