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How does a function differ from an equation?
A function is a rule to calculate a variable, based on one or more other variables. It may be written as an equation, but unlike a generic equation, in a function, for every value of the input variables, it may ONLY have ONE result.
How many zeros can you have in an algebraic function?
For an algebraic function in one variable, as many as the highest power of the variable.
How do you know whether a relation is a function?
Use the definition of a function. If, for any value of one variable, there is only a single possible value of the second variable, then the second variable is a function of the first variable. The second variable is often called the "dependent variable". If you can solve an equation explicitly for the dependent variable, then it is a function. If you can NOT solve it for a variable, it may or may not be a function - it turns out that some equations are hard or impossible to solve explicitly for one of the variables.
A function takes in values of variable called inputs and gives back values of the variable called outputs?
No. A function takes in values of no, one, or more input variables, and returns no or one result. It cannot return more than one result. Do not confuse this with returning multiple results using call by reference parameters - this is not the same thing.
How do you determine if a function is linear?
A function is linear if it is of the form f(x) = mx + c where m and c are constants and a is not zero.The function implies that an increase of one unit in the input variable, x, always results in an increase of m units in the output.
