What a function is

What is a function you ask??? A function is a mathematical equation that represents steps you follow to bring together a sequence or graphed line. For example, (look at picture). This function states that y equals double the x variable plus 3. The graphed line represents the numbers that would correspond to this function. Meaning that when you want to fight the y variable with any x variable, you go along the line made to where the x and y variables would meet.