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**Conjunction Junction What’s Your Function?**

Functions at their finest…

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**What is a Function? (Mathematically speaking…)**

A function is a one-to-one correspondence For every x, there is a unique value for y

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**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

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**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).

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**What does this look like as a graph?**

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**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)

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**What this looks like as a graph**

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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.

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**Let’s Practice! Is it a function?**

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**Let’s Practice! Is it a function?**

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**Let’s Practice! Is it a function?**

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**Let’s Practice! Is it a function?**

X Y Why or why not???

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