Hi, It's Mona :) Here's a quick recap on what a function is, and how to use it. A function is a relation where each x value is related to only one y value. So y values can be related to more than one different x values, but not the other way around. One way of testing if a relation is a function or not is through the vertical line test. To do this you graph the relation and pass a vertical line over the graph. If the vertical line ever intersects the graph more than once, then it's not a function. Functions have a special notation. In function notation, you put an f(x) where you would otherwise use a y. For example, instead of writing "y = x + 6", you would write "f(x) = x + 6". When you are evaluating a function, there is an input and an output. The input is x, so wherever you see an x you can just replace it with your input. The output is whatever f(x) is equal to, once you replace all the x-es with your input. It is also equal to y.
For the second video it's more helpful after about 3:50. (But the first part is also cool :P )
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