Represent Systems by Graphing

Use the graph comparing two phone plans. Each plan includes a fixed monthly fee, plus a fee based on the number of hours used. Which plan offers a better deal?

• Plan P

• Plan Q

Use the graph comparing the cost of two laundry services. Each service charges a fixed fee and a price per pound of laundry. Compare the slopes. What does this tell you?

Use the graph comparing the cost of two laundry services. Each service charges a fixed fee and a price per pound of laundry. Compare the y-intercepts. What does this tell you?

• Sudz Charges $2 more for it's fixed fee

• Sudz Charges $2 less for it's fixed fee

• Clean Machine Charges $2 more for it's fixed fee

• Clean Machine Charges $2 less for it's fixed fee

Based on the graph, which of the following is true?

• For a 1-hour rental, Shop X is a better deal.

• For a 6-hour rental, both shops have the same cost.

• Shop Y is a better deal for any number of hours.

• It costs $6 to rent a bike for 3 hours at either shop.

Solve this system of equations by graphing.

y = 1/2x + 2

y = -3x + 9

• (2, 3)

• (-2, -3)

• (3, 2)

• (-3, 2)

Solve the following system by graphing.  What is the solution?

• (3, -2)

• (3, -3)

• (-3, 2)

• (-3, -2)

Solve the following system by graphing.  What is the solution?

• Infinity

• (3, 3)

• (3, -3)

• (-3, 3)

Solve the following system by graphing.  What is the solution?

• Infinite number of solutions

• (3, 3)

• (3, -3)

• (-3, 3)

What is the solution to this system of equations?

• (1,0)

• (-3, -1)

• (-1,-3)

• (1,3)

What is the solution to this system of equations?

• (1,4)

• (4,1)

• (3,5)

• (-1, 4)