Nannette installed a security system in her office for $150 the monthly monitoring fee is $30. So far, Nannette has spent $420 f
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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: