The monthly cost (in dollars) of a long-distance phone plan is a linear function of the calling time (in minutes). The monthly cost for 51 minutes of calls is $13.48 and the monthly cost for 97 minutes is $$19.00. What is the monthly cost for 94 minutes?

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c

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step-by-step explanation: