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## how to do I make a graph?

Your cost is 20 dollars plus 5 cents times the number of minutes you use your
phone.   C = 0.05m + 20

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.

I hope you did well with your graph. I'm entering the following explanation for those who might still benefit from your question:

Your graph will look like a large L shape. As you go up the left side, put higher dollar amounts to measure as your monthly cost increases from the 20 dollar minimum. Your number of minutes will start at zero at bottom left and will increase as you go from left to right across the bottom.