Definition
The slope m of
the line through the points (x_{1}, y_{1}) and (x _{2}, y _{2}) is given by

Example Problem
Find the slope of the line segment joining the points ( 1,  4 ) and (  4, 2 ). 
Solution
Label the points as x_{1} = 1,
y_{1}
=  4, x_{2}
= 4, and y_{2} = 2. To find the slope m
of the line segment joining the points, use the slope
formula : So, m =  6/5. 
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