Answer:
The average rate of change is -2
Step-by-step explanation:
we know that
To find out the average rate of change, we divide the change in the output value by the change in the input value.
In a linear function the average rate of change is a constant and is equal to the slope of the function
The linear function in slope intercept form is equal to
[tex]f(x)=mx+b[/tex]
where
m is the slope or unit rate of the linear function
b is the y-intercept or initial value of the linear function
In this problem we have
[tex]f(x)=-2x+70[/tex]
so
[tex]m=-2\\b=70[/tex]
therefore
The average rate of change is -2
