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**sweetangel786****Member**- Registered: 2006-03-18
- Posts: 20

hi, i know i have asked many questions, i have my mock exam 2morro and i still don't understand on equations i know other things in maths but i have problems on learning this..

i don't understand :

how to work out equations, i have asked this question b4 few dayz ago, but i iam stil very confused about it.

understanding this will really help me if anybody can...

it will help me on my mock exam 2morro.. please can u help me to understand equations and algebra ....

thanks u all very much if u can help me..... it's very importatnt i learn it and understand it by 2day... in the evening..

thank u.. sweetangel786.....

practise makes people perfect, but nobody's perfect so why practise...

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**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,786

sweetangel786, I shall try to explain to you about equations.

A mathematical equation is putting two like (or equal or same) together and showing they are equal.

For example,

Q1) Find x if 8x + 12 = 60.

It is given that 8x+12=60.

We can take away 12 from both sides,

Therefore, 8x=60-12=48.

If 8 pens were to cost $48, you knoe the cost of each is 48/8=6.

Similarly, here x=6 since 8x=48.

Q2. If 3x + 2y = 16 and 2x-y=1, find x and y.

(These are called simultaneous equations of two variables)

Lets take 3x + 2y = 16 as equation (1)

and 2x - y = 1 as equation (2).

We have to first eliminate one variable, that is either x or y.

In order to do that, we have to make x or y equal in both the equations. Lets eleminate y here.

3x + 2y = 16 ... equation (1)

equation (2) x 2 : 4x - 2y = 2

Adding equations (1) and (2)

3x+4x +2y+-2y = 16-2.

7x = 14,**x=2.**

Now put x=2 in equation(1)

3x + 2y = 16

3(2) + 2y = 16

6 + 2y = 16

2y = 16-6 = 10.

Therefore, y = 10/2 = 5.**Therefore, the solution is x=2, y=5.**

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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