What Is the Slope of the Inverse of f(x)?

In summary, the slope of an inverse function is the reciprocal of the slope of the original function. To find the slope of an inverse function, take the derivative of the original function and find the reciprocal of that derivative. The slope of an inverse function is important because it tells us the rate of change and relationship between the original and inverse functions. It can be positive or negative, depending on the behavior of the original function, and it is the reciprocal of the slope of the original function at the corresponding point.
  • #1
aisha
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:smile: My question says f(x)=(-5/7)x-3 determine the slope of f^-1(x) without finding the inverse. I think the answer is the slope of f^-1(x)=(-7/5)x
Is this correct?
 
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  • #2
Yes. It is correct. Once again, you can check this by graphing the function and seeing the reflection over f(x) = x
 
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  • #3
I actually had the same question, where did the -3 go?
 
  • #4
MaryB, the -3 has nothing to do with the slope.
 
  • #5


Yes, your answer is correct. The slope of the inverse function is the reciprocal of the slope of the original function. In this case, the slope of f(x) is -5/7, so the slope of f^-1(x) is (-7/5). This is because the inverse function "flips" the x and y coordinates, so the rise and run of the original function become the run and rise of the inverse function, respectively.
 

FAQ: What Is the Slope of the Inverse of f(x)?

What is the slope of an inverse function?

The slope of an inverse function is the reciprocal of the slope of the original function. This means that if the slope of the original function is m, the slope of the inverse function will be 1/m.

How do you find the slope of an inverse function?

To find the slope of an inverse function, take the derivative of the original function, then find the reciprocal of that derivative. This will give you the slope of the inverse function at any given point.

Why is the slope of an inverse function important?

The slope of an inverse function is important because it tells us the rate of change of the inverse function at any given point. This can help us understand the behavior and relationships of the original and inverse functions.

Can the slope of an inverse function be negative?

Yes, the slope of an inverse function can be negative. This means that the original function is decreasing while the inverse function is increasing, or vice versa. The sign of the slope depends on the behavior of the original function.

How does the slope of an inverse function relate to the slope of the original function at a point?

The slope of an inverse function is the reciprocal of the slope of the original function at the corresponding point. This means that if the slope of the original function is positive, the slope of the inverse function will be positive as well. Similarly, if the slope of the original function is negative, the slope of the inverse function will be negative.

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