| Ms. Russell's Guides Linear Functions |
| What is a Function? The Definition of a Line The Big Deal with Slopes How Can I remember? Putting It Together Quiz Yourself |
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What is a Function?
A function is a relation in which every input value can have only one output value. In other words For every "x" there is only one "y" and that means It Passes the Vertical Line Test To use the Vertical Line Test, simply draw imaginary vertical lines through your graph. If a vertical line passes through more than one spot on the graph, then it fails and is not a function. If it only passes through once, then it passes and is a function. |
This is a Function Machine
 To use this machine, we put a number in to the "INPUT" screen. The machine will take your function, do the calculations and the final result shows up in the "OUTPUT" screen. It is key to know: If it is a function, then each number that you input will give you only one result! |
