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Find a if the point (3,a) is on the line that passes through (-2,7) and (5,-8).

 Dec 7, 2021
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3 is  5/7th   of the way from  -2   to 5 

5/7th  fo the way from 7 to -8   is     7 - 5/7 (15) = 7 - 75/7 = - 26/7

 Dec 7, 2021

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