There's a couple of ways you can solve this. I'll show you the way I prefer, but your mileage may vary. First (and this is true in every method), to find the equation of a line you absolutely need the slope. They'll either give you the slope or, like in this case, they'll give you...

## Answers by David M.

Many percentage problems like this one can be worked if you remember a basic equation: [Whole Value] x [percentage in decimal form] = [Partial value] In this case, we know the "Whole value" (480) and the "Partial Value" (72). This gives us an equation with only...