Standard Form for Linear Equations - Definition & Examples

You've inherited your own country and need to make a flag. The company you contact says that stripes cost $\$2$ and stars cost $\$3$. They also inform you on a special deal they're running where you can get the Internet Explorer icon for $\$0.25$. If you only have $\$18$ write the standard equation for the amount of stripes and Internet Explorer icons you can place on your flag?