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Subtract the y-coordinates. This is the rise.
Subtract the x-coordinates in the same order. This is the run.
Slope = rise/run.
Subtract the y-coordinates: -6 - 15 = -21. rise = -21
Subtract the x-coordinates in the same order:5 - 2 = 3. run = 3
slope = rise/run = -21/3 = -7
Divide 5/8 by 150, to see how thick each is, that'll give you 150 even pieces that add up to 5/8
The newspaper carrier can deliver 147 newspapers in 3 hours