Suppose that you decide to participate in a charity walkathon to raise money for your cause. Some people decide to donate a fixed amount, while others agree to donate a little money for every mile you walk. Before the event starts, you raised $25, and you have been pledged $1.50 for each mile you walk. The function defined by d(m)=1.5m+25 can be used to relate the miles you walk, m, and the amount of money donated to you in dollars, d(m).
