Randy M. answered 08/25/12
Econ/Algebra/Pre-Calc/Stats using real words for real understanding
You are trying to show how much your phone bill will be (COST) when you use it (m minutes). Draw your axis for your graph. Place C on the vertical axis (up and down) since that is what you want to know. Place m on the horizontal axis (left-right) since this is what you are going to do use the phone.
Now, first let's see what C will be if you don't use the phone at all (that is when m=0). Plug in 0 for m and see what C equals: should look like this: C = 0.05 * 0 + 20
That is one point on the graph.
Next, we need one more point to make a line so let's see what C is if you use the phone 1 minute ( let m = 1). Plug in 1 for m and again see what C equals then.
That's 2 points draw a line through your 2 points and you have your graph.
David O.Please look at mine and help me 🙏🏻