As you are going through the sections in Chapters 6 & 7, you will notice that we are working with functions.

1. Please explain to the class:
   • How to plot an ordered pair (x, y).
   • How to check if an ordered pair is a solution of an equation.
     
   • What it means to have a slope of "0".  Provide an equation as an example. 
     
   • What it means to have an undefined slope.  Provide an equation as an example.  
2. Please provide detailed explanation and numerical examples for each answer.