This week I learned about functions; what is a function, what isn’t, and how they are used. Functions are basically just equations. They are written like this:
f(x)=18x+12
x is the variable, or input value. For this example, 11 will be used as the variable.
f(11)=18x+12
f(11)=18(11)+12
= 210
f(x)=210
Functions can also be written in a table, or t chart, like the following:
The way you determine whether or not something like this is a function or not, is you look at all of the x (or input) values, and if any of them repeat, then it is a relation, and not a function. The same is true for graphs. In the previous example, the x values do not repeat, so it is a function.