You want to buy some pens on the Internet. One website charges $8 for the shipping fee and $3 for each pen. Another website charges $ 10 for the shipping fee and $3 for each pen. The equations for the total cost of money in both websites are given below. Graph each equation , then find the difference in cost between the websites if you buy 8 pens.
Website 1 : c = 3p + 8
Website 2: c = 3p + 10
