Mary's Problem: One cell phone provider charges $10 per month plus an activation fee of $20. A second cell phone provider charges $15 per month plus an activation fee of $10. In
what month was the cost of the service the same?
Mary's Graph:
40
70
10
a.) What is the solution to the graph of Mary's system of equations?
b.) What is the meaning of her solution?
c.) Using Mary's problem, write the system of equations that Mary graphed