How to do linear and exponential functions

Linear function is process where you are going to use a graph and a line to show how a certain equation works. While exponential functions are a function that involves exponents. And exponential function is always positive.
Pls. see attached image for example of linear and exponential function:
For example:

Step-by-step explanation:

A positive parabola is one that has a + sign out front or no sign at all (and the positive is understood).  A positive parabola opens like a cup with a bottom.  Therefore, the positive parabola has a min value.  A negative parabola opens upside down, like a mountain with a peak.  Therefore, the negative parabola has a max value.