Notes, Algebra

Equation: mathematical statement with 2 expressions that have the same value.
eg: x+2=3 y-7=(-4)
3a-2=a+2 6=4



Isolate the variable = get the letter by itself.


here is a question for you:


Identify- variable, numerical coefficient, constant,
5y-6=
variable= y numerical coefficient= 5 constant=(-6)

you most memorize these opposite opperations:

+,- x, / -,+ /,x

here is another question: (remember to box your answer)


a+4=10
a+4-4=10-4
a=6
check
a+4=10
6+4=10
10=10


here is video to help you out:

www.youtube.com/watch?v=bAerID24QJ019


here is a website to help you guys out:
http://www.helpingwithmath.com/resources/wor_algebra.htm



I hope this helped you guys out!!

BEDMAS

BEDMAS Is the sequence of operations that must be followed when solving a math sum with several different operations in it.



Brackets=( )

Exponents= a* or ^

Divisions = /

Multiplication=x

Addition=+

Subtraction=-



For eg:


Following the steps of BEDMAS
2x(4+8)/2-1=
1. Bracket..add (4+8)

2x(12/2)-1=
2. divide (12/2)

(2x6)-1
3. multiply(2x6)

12-1=11
4. subtract(12-1)




Here is some to practise:



3x(5+4)/3+3-4=

3x(9/3)+3-4=

(3x3)+3-4=

(9+3)-4=

12-4=8



4+(8/2)-4x2=

4+4-(4x2)=

(4+4)-8=

8-8=0



TIP: Insert a new bracket every time you are doing the next operation in the rule of BEDMAS.

Here is a link to help you out:

http://mathcentral.uregina.ca/QandQ/topics/bedmas



Here is some video's for you.

http://www.youtube.com/watch?v=ZOs_NjLtIHc&feature=channel

http://www.youtube.com/watch?v=gMZcgftBIH0

http://www.youtube.com/watch?v=BdaZdloHiCg&feature=channel

corrections for number 12

This scribe post will be talking about how to answer question 12.





Question 12 asked: what is the fixed point about which a rotation occurs?





Answer: The centre of rotation.





The solution: its the point which the image is rotating around. It is a fixed point at one end of the image or the point can form an imaginary circle which the image follows.












eg: the images shows you a shape rotating around its centre of rotation.






Drawing should state clockwise---->



















click on link:

http://www.mathwarehouse.com/transformations/rotations-in-math.php





Video link: Note scroll to bottom of page.

http://www.onlinemathlearning.com/rotation-transformation.html