Posted by **trina** on Monday, September 7, 2009 at 10:55am.

Draw a graph of the mirror line y=x, the function f:x 3x+2 and its inverse f`1 x x-2/3, for the domain of x, -2<x<8

x -2 0 4 8

y=x -2 0 4 8

These numbers were given to me what i want to know is why 0 and 4 and how do i come up with the numbers on my own for future questions??

- mathematics -
**Dr Russ**, Monday, September 7, 2009 at 11:15am
The choice of x vales to use depends very much on the question and what you are asked to show. It is quite usual to calculate the value for x=0. In this case where the function is a straight line you only really need to have values for x=-2 and x=8 and then draw the straight line between them.

Where the function is not a straight line then having several values helps to construct the line. It is usual to have both +ve and - values of x.

- mathematics -
**MathMate**, Monday, September 7, 2009 at 12:51pm
The question requires you to graph the three functions. The x-values given are suggested values, as explained by Dr. Russ.

Plot the functions graphically and you will be able to make observations and remarks.

Here's my version of the graph:

http://i263.photobucket.com/albums/ii157/mathmate/trina.png

## Answer this Question

## Related Questions

- algebra - 1 (a) A function passes through the points (0, -5), (1, 0), (2, 7). ...
- PreCalc! - sketch a graph whose domain is the interval [0, infinity) but whose ...
- precalculus - Find the inverse of the function below. Graph the function below ...
- Math / Algebra - Can you check my work? Thank you :) 1. The Domain of a function...
- Advanced Algebra - What is the inverse of each of the functions defined by the ...
- pre calculus - Find the inverse of the function below. Graph the function below ...
- College Algebra - Find the inverse of the function below. Graph the function ...
- precalculus - find the inverse of the function, graph the inverse function, ...
- algebra - why is the graph of an inverse flipped over the line y=x instead of ...
- Maths B - (a) What is the inverse of the function y = 3x2 ? (b) On the same set ...