You can do this 2 ways. First, you can determine the new cost compared to last year as 20/15 or 4/3. So multiply 4/3×$19950=$26,600 Second, you can look at it as 19950÷15 to find how many tickets sold last year and then multiply by $20, the new price
Directly proportional means if x has a certain value, y should have the same value. but here in the graph, when x is 0, y has a value greater than 0. for x and y to be directly proportional, the line should go through 0.
