We can easily solve this by assuming a linear equation.
The general form is:
y = m x + b
where y is the price of gas, x is the year, m is the
slope or increase in price every year and b is the y-intercept
We can solve the slope by:
m = (3.25 – 1.75) / (2013 – 2003)
m = 0.15
y = 0.15 x + b
Using any pair data, we get the b:
3.25 = 0.15 (2013) + b
b = -298.7
y = 0.15 x – 298.7
