### Scribe Post for January 7

Wednesday, January 7, 2009
Hey, it's me again. I am here to show you how to do the questions Mr.Harbeck gave us. He said to prove or disprove that these are equal. Here's the first one:

-5 -2 +n = n -7

To do this, you have to simplify and combine the like terms on one side. just combine the -5 and -2. The equation should look like this:

-7 + n = n - 7

Now he said to do this two different ways. The second way to do this is by using the algebra tiles... you can do that right?

Okay, now for the other two questions: 2n=10 and n/2=10.

Here's how I did them.

First 2n=10. to do this you just have to figure out what n is.

Just divide 10 by what ever the number of variables is. REMEMBER: CANCEL USING THE OPPOSITE.

2n=10

10/2=5

Then you multiply the result by 2 and see if it equals 10.

2x5=10

10=10

Now for the other question.

n/2=10

Do this question by CANCELING USING THE OPPOSITE METHOD. IN THIS CASE USE MULTIPLICATION.

This time multiply the answer by the constant.

2x10=n
2x10=20

n=20

Then verify.

20/2=10

10=10

Hope this helps! The next scribe is Jaymie.