Assume the  cost in dollars of a call, y, is a linear function of the time in minutes, the linear equation that gives the cost of a Sunday call is y = 0.05x + 0.34
How to model a linear function
The linear equation is represented as follows:
y = mx + b
where
m = slope
b = y -intercept
Therefore,
(44, 2.54)(10, 0.84)
m = [tex]\frac{0.84-2.54}{10-44}[/tex]
m = [tex]\frac{-1.7}{-34}[/tex]
m = $0.05
Therefore,
y = cost in dollars
x = time in minutes
0.84 = 0.05(10) + b
0.84 - 0.5 = b
b = 0.34
Therefore,
y = 0.05x + 0.34
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