## Algebra: A Combined Approach (4th Edition)

Slope $=62$ Approximately, there's an increase of 62 billion dollars spent in tourism every year.
$y$ is the amount of money spent worldwide on tourism. $x$ is the year. Slope $=\frac{\Delta y}{\Delta x}$ Slope $=\frac{798-550}{2007-2003}$ Slope $=\frac{248}{4}$ Slope $=62$ Approximately, there's an increase of 62 billion dollars spent in tourism every year.