You and your friend are saving for college. You have $50 and are added $10 each week to your savings. Your friend has $20 and he is adding $20 each week to his savings.

a. what system of equations would be a good model for this situation? Let x be number of weeks and y be the number of dollars saved.

b. Graph your system of equations

c. use the graph to determine when you and your friend will have the same amount of money saved. Explain your answer