Posted by **Hanna** on Sunday, August 26, 2007 at 9:40pm.

Find an equation of the line that is tangent to the graph of f and parallel to the given line

Function: f(x) = x^3

Line 3x-y+1 = 0

._.; I know the derivative of the function is 3x^2 and I do have the answer in the back of my book just need the way to get it..

- Math- Calculus -
**Corin**, Monday, August 27, 2007 at 12:24am
Sorry in advance-- I don't know how to find the answer, but I'm willing to help all I can.

First, rearrange the equation of the line to make it y=-3x-1. Since we need to find a line parallel to this one, we know it needs a slope of -3.

y=-3x-1

y=mx+b

m=slope

m=-3

What is the answer the back of the book gives? Sometimes it's possible to work backwards from the answer.

Sorry that's as far as I could go.

I'll try to help you out all I can--I'm trying to work it out right now.

--Cori

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