Chapter 4

This week in advanced math we continued in chapter 4. We learned how to decide if a graph was a function and now we learned how to tell if a graph is an inverse. You do this by the vertical line test. We also learned how to find an inverse.

To find and inverse:

1) switch x and y

2) solve for y

If the formula is squared or or taking the absolute value then it is not an inverse.

To check if something is an inverse:

1) do f(g(x))= x and g(f(x))

Also in section 4-4 we learned about stretching and shrinking graphs.

• When you multiply a variable by a number less than 1 it makes the graph shorter and fatter.
• When you multiply a variable by a number bigger than 1 it makes it skinnier and longer.