# of Customers Maintenance Cost ($)January 500 2250February 400 2200March 450 2200April 600 2600May 300 1950June 350 2250

250 300 350 400 450 500 550 600 6500

500

1000

1500

2000

2500

3000

f(x) = 1.7 x + 1505

250 300 350 400 450 500 550 600 6500

500

1000

1500

2000

2500

3000

f(x) = 1.7 x + 1505