1. Inverse Functions Lesson Warm-Up Included
Algebra I

2. REVIEW Warm-Up for Inverse Function Lesson
1. A relation is a set of _______________ ___________.
2. A function is a special relation where there is ________________________________ _______________________________________________________________________.
3. Create ordered pairs for the function displayed in the mapping.
4. Inverse Operations UNDO one another. State the inverse operation.
a. Addition
b. Subtraction
c. Multiplication
d. Division
e. Squaring -6 -4 -1 6 -2 3 4
Talk about a regular function is
The inverse function is
Really you are just switching your
input and output, or x and y values.
Show ordered pairs of

3. If you watched the Kahn Academy video, he talked through solving for the opposite variable, solving for x (which is highly unusual with a linear function … we always solve for y … think of y=mx+b, etc.) Then he showed swapping out the y for the x at the end.
That’s all fine and good, but I actually find it easier to swap the variables in the first place and solve for y (like we are used to doing).
If you understand that INVERSES undo and go backwards … (instead of DR … RD; instead of xy, yx) swap them right up front!

4. Suppose you are given the following directions:
From home, go north on Rt 23 for 5 miles
Turn east (right) onto Orchard Street
Go to the 3rd traffic light and turn north (left) onto Avon Drive
Tracy’s house is the 5th house on the right.
If you start from Tracy’s house, write down the directions to get home.
How did you come up with the directions to get home from Tracy’s?

5. Suppose you are given the following algorithm:
Starting with a number, add 5 to it
Divide the result by 3
Subtract 4 from that quantity
Double your result
The final result is 10. Working backwards knowing this result,
find the original number. Show your work.

6. Suppose you are given the following algorithm:
Starting with a number, add 5 to it
Divide the result by 3
Subtract 4 from that quantity
Double your result
The final result is 10. Working backwards knowing this result,
find the original number. Show your work.
Write a function f(x), which when given a number x (the original number) will model the operations given above.
Write a function g(x), which when given a number x (the final result), will model the backward algorithm that you came up with above.

7. Find the algebraic inverse.
(Swap x and y, then solve for y.) 1. 2.

8. On the Kahn Academy video, you were shown how a function and it’s inverse reflect over the line y=x..
This is a great example.
The green line is
The red line is

9. On the Kahn Academy video, you were shown how a function and it’s inverse reflect over the line y=x..
This is a CRAZY example.
The green line is
The red line is

10. Is the inverse a function
Is the inverse a function? If the inverse is not a function, how can you restrict the domain of the original function so that the inverse is also a function?

11. Is the inverse a function
Is the inverse a function? If the inverse is not a function, how can you restrict the domain of the original function so that the inverse is also a function?

12. Go to Kahn Academy and watch the video for Inverse Functions Example 2
Find if