Yes, I'd have thought they were right. y= 11/2x and y= 2500 + 1/2x We are trying to find out when we break even. Basically, we are trying to find out where the two lines intercept on the graph. You could either plot and graph and find out from there, or take an algebraic approach! Algebra: When lines intercept on a graph, it means that they have common x and y co-ordinates. Therefore, when the lines y= 11/2x and y= 2500 + 1/2x intercept, it must mean that: y = y (We have to do it this way instead of x=x because we don't know x and that is what we're trying to find. If we do x=x, then we get rid of the x variable and there would be no point to our equation. Don't worry too much if you don't get this.) 5.5x = 2500 + 0.5x (I've used decimals instead of fractions, they're look better on the computer) Let's solve this! 5x = 2500 x = 500 It will take 500 trips to work in order to break even! Hope that helps!