53y-42y=55
11y=55
Y=55/11 =5
The rate of change is the slope. The slope is the number in front of the x
Function 1 rate of change is -1/2
Function 2 rate of change is -3/4
The greater rate of change would be the steepest slope.
Function 2 has the greater rate of change
See the attached picture.
She spent $2.50 for the smoothie (before the tip).