Posted by **bobbie** on Thursday, March 15, 2012 at 12:09pm.

Given the function f(x) = 3x - 9

a. Find the rate of change between the two stated values for x: 7 to 8

b. Find the equation of a secant line containing the given points: (7, f(7)) and (8, f(8))

- calculus -
**Reiny**, Thursday, March 15, 2012 at 12:14pm
curious question in Calculus.

Since the function is a straight line, it seems very odd to be talking about secant lines, anyway ....

f(7) = 12

f(8) = 15

rate of change = (15-12)/(8-7) = 3

Note that this is the slope of the given line as expected.

The equation of the secant line would of course be the line itself , or f(x) = 3x-9

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