Asked by barney

find the average rate of change:
f(x)=7x-6
(a,f(a)) and (b,f(b))
Answered by bobpursley
Well, with calculus you can look at it and see 7 as the rate of change.
In precal,

avg rate= (f(b)-f(a))/(b-a)=(7b-6-7a+6)/(b-a)= 7 (b-a)/(b-a)=7
Answered by oobleck
by inspection, f(x) is a linear function, with slope = 7
since the slope is constant, the average rate of change is just 7.
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