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what is the slope of straight line that passes through (-1,1) and (4,3)

what is the slope of the straight line that passes through 
(-1,1) and (4,3)

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Amarjeet K. | Professional Engineer for Math and Science TuroringProfessional Engineer for Math and Scien...
4.6 4.6 (8 lesson ratings) (8)
Slope of line is tanjent of angle the line makes with positive x- axis
= difference of y coordinates/ diference of x coordinates = (3-1)/(4-(-1)) = 2/5