1. Conjunction Junction What’s Your Function?
Functions at their finest…

2. What is a Function? (Mathematically speaking…)
A function is a one-to-one correspondence
For every x, there is a unique value for y

3. What is a Function? (From a Girl’s point of view…)
X can only have one Y value
X (boys) can only have one Y (girlfriend)
For instance X Y

4. Why boys can’t “cheat”…
Boys are not allowed to “cheat” on girls (x can only have one y)
This is illegal X Y
The same boy (x) has two different girls (y).

5. What does this look like as a graph?

6. Why girls can “cheat”… Y (girls) can have more than one X (boys)
This is legal X Y
The same girl (Y) has two different boys (X)

7. What this looks like as a graph

8. Vertical Line Test
If you draw vertical lines through the graph and the line only crosses the graph once, it IS a function.
If you draw vertical lines through the graph and the line crosses the graph more than once, it is NOT a function.

9. Let’s Practice! Is it a function?

10. Let’s Practice! Is it a function?

11. Let’s Practice! Is it a function?

12. Let’s Practice! Is it a function?X Y
Why or why not???