1. Algebra 1
September 21 & 22, 2018

2. functions
Last class: we introduced domain and range and how you can find these by looking at the numbers you are given
Are there any questions on domain and range?
We’re going to continue with domain and range, but now we’re going to be looking at graphs

3. Functions – domain and range
Remember…
Domain: The complete set of x values that can be used in the function
Range: The complete set of y values that can be used in the function

4. Functions – domain and range
So, what’s changed?
Just the fact that we now have a picture to look at. That’s it!
But first, let’s add a few extra things…nothing terrible, I promise.

5. Functions – domain and range
X-intercept: This is where the graph crosses over the horizontal (or x) axis
Y-intercept: This is where the graph crosses over the vertical (or y) axis
Graphs can have more than one of each or none at all

6. Functions – domain and range

7. Functions – domain and range

8. Functions – domain and range