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# Table shows the number of cellular phone subscribers in the United States and their average monthly bill in the years from 2000 to 2010.

Equation, expression, and inequalitie
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asked 2021-08-14

Table shows the number of cellular phone subscribers in the United States and their average monthly bill in the years from 2000 to 2010.
$$\begin{matrix}\text{Year}&\text{Subscribers}&\text{Average Local}\\ \text{ }\ &\text{(millions)}&\text{Monthly Bill (\)}\\ \text{2000}&\text{109.5}&\text{45.27}\\ \text{2001}&\text{128.4}&\text{47.37}\\ \text{2002}&\text{140.8}&\text{48.40}\\ \text{2003}&\text{158.7}&\text{49.91}\\ \text{2004}&\text{182.1}&\text{50.64}\\ \text{2005}&\text{207.9}&\text{49.98}\\ \text{2006}&\text{233.0}&\text{50.56}\\ \text{2007}&\text{255.4}&\text{49.79}\\ \text{2008}&\text{262.7}&\text{50.07}\\ \text{2009}&\text{276.6}&\text{48.16}\\ \text{2010}&\text{300.5}&\text{47.21}\\ \end{matrix}$$
One of the scatter plots clearly suggests a linear model. Use the points at t = 10 and t = 20 to find a model in the form y=mx+b.y=mx+b.

## Expert Answers (1)

2021-08-15
(10, 109.5)(20,300.5)
Slope=191/10 19.1
y-109.5=19.1(x-10)
y-109.5=19.1x-19.1
y=19.1x-81.5

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