For Joe's illness, the doctor gave him a prescription of 28 pills. He needs to take 4 pills the first day, and then 2 pills each
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For this case we have that by definition, the slope of a line is given by:
Where:
and
are two points through which the line passes.
According to the image we have:
Substituting we have:
Thus, the slope of the line is:
Answer: