precalculas
posted by ladybug .
can someone please help me with this question?
Given the function f(x)=3x9
Find the rate of the change between the stated values for x: 7 to 8
A. Find the equation of a secant line containg the given point (7,f,(7)) and (8,f,8))
B. Find the rate of change between the stated values for x: 7 to 8

z. f(x)=3x9
b. rate of change is 3
explaination: find the two points (at x=7, and x=8).
then find the slope (f(8)f(7)/(1))
then the equation is of the form y=slope*x+b. Put either point in, and solve fodr b.