Hence $4.50 per hour is the rate of change.
Amount in tips each night = $10
Amount made per hour = $4.50
The rate of change will be the figure or amount that remains unchaged.
The above can be modelled in a linear form
Linear form: y = mx +c
y is the dependent variable
x is the independent variable
m is slope. And in this case, it is the rate of change
c is the constant.
Let y represent the total amount received each night
To represent our given question in a linear form as indicated above:
y = 4.5x + 10
x is the number of hours she worked
c is the additional money she receives (the tips)
m = 4.5. This is the rate of change.
Hence $4.50 per hour is the rate of change.