A taxi driver charges ${\$6.00}$ just to get in the cab and ${\$4.50}$ per mile. To find the total cost of a taxicab ride we use the formula where $C$ is the fare in dollars and $M$ is the number of miles traveled. Below is a graph of this equation. If you would like to enlarge the graph or make numbers and letters easier to read, you may click on it to open it in a new window. You may then enlarge that window with your mouse. To further enlarge the image, use your browser’s zoom capabilities. On a PC this is usually ctrl shift + (and zooming out is ctrl -). On an Apple computer this is usually apple shift + (and zooming out is apple -).

What will the charge be to go $9$ miles? (Use the formula to find the exact value.) Use the graph to estimate how many miles you can travel for ${\$213.00}$. (Use the graph to make an estimate; wiggle room is programmed into the question.)