Paint Coverage Area Painted (1)
1,800
1,600
1,400
1,200
1,000
800
8 600
400
200
0 12 3
Number of Gallons of Paint

The rate of change in this relationship is maximum 400 square feet of area painted for every gallon
of paint used
What key feature of the function is used to calculate that rate of change?
O x-intercept
O zero
O y-intercept
O slope