Emily and a friend bought two tickets to see a soccer game . each ticket cost $8.25. the friends paid a total of $24.50, which included a fee per ticket for parking near the stadium. what is the parking fee as a percent increase in the cost of a ticket?

U will need to convert those two numbers and then subtract them 

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for