John R. answered • 10/08/12

John R: Math, Science, and History Teacher

If I understand correctly, there are three problems that you want me to check.

First, you are asking if your definition of a function is correct. The only thing that I would change about your definition is that I would add the fact that each input (or set of inputs) will prouce only one output.

Secondly, you are demonstrating how to solve an addition problem. You have some problems with your steps. I think the steps you want to write are as follows:

1. x - 3 = 3

2. x - 3 + 3 = 3 + 3

3. x + 0 = 6

4. x = 6

Check:

1. x - 3 = 3

2. 6 - 3 = 3

3. 3 = 3

For the third problem, I think you are demonstrating your ability to solve subtraction problems. Your work looks completely accurately for this problem.

As a separate note, I recommend that you write numbers next to your steps (like I did) when you are wanting someone to check your work. It helps the tutor reference the steps in our recommendations to you.

Pam K.

Thanks so much for your help!

10/09/12