Question 416765
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Hi
Using the point-slope formula, {{{m =(y[2] - y[1])/(x[2] - x[1])}}}
(-15, 70) and 
( 5,  10)   m = 60/-20 = -3
OR
( 5,  10)
(-15, 70)  m = -60/20 = -3      |the results are the same