### Scribe Post for Feb.11,2009

Today in math class we checked the test we did yesterday and I am going to show how to solve 2 of the given problems.

9m=3m-48

The fist thing to do is to move the variable to the left sides.

I subtracted both sides of the equation by -3m to cancel the variable on the right side.Remember that what you did to the right side, you must do it to the left side and vice-versa.

We have to get rid of multiplication, so we have to divide both sides of the equation by the numerical coefficient 6. Again remember that what you did to the left side, you must do it to the right side.

To check if your answer is correct:

1. copy the given equation

9

*m*= 3

*m*- 48

2. substitute the answer (-8) to m

9

*(-8)*= 3

*(-8)*-48

3. solve

-72= -72

The next one I am going to solve is a word problem.

5. You bought a pen for $5 and 4 erasers. You spent a total $25. How much did each eraser cost?

First we have to represent the cost of each eraser by n

Let n = cost of each eraser

4n + 5 = 25 translate words into equations

4n + 5 = 25 simplify the equation by subtracting both sides of the

-5 = -5 equation by 5

_______________

4n/4 = 20/4 divide both sides of the equation by 4

* n = 5 ~~~~~ the cost of each eraser*

* *

to check the answer, write the equation

* 4n + 5 =25*

substitute n by the answer which is 5

4*(5)* + 5 = 25

20 + 5 = 25

25 = 25

For the next scribe I pick CHRISTIAN...
## 6 Responses to "Scribe Post for Feb.11,2009"

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