# Math Help - Simultaneous equation 2 unknown vairables

1. ## Simultaneous equation 2 unknown vairables

Hi i have the following problem..

0.00243 = 200/E - V/E (100)

0.00057 = 100/E - V/E(200)

I have been asked calc E & V from the equations.. I've tried sbstitution to solve it but I cannot seem to isolate any 1 of the vairables

Bailey

2. Originally Posted by Bailey
Hi i have the following problem..

0.00243 = 200/E - V/E (100)

0.00057 = 100/E - V/E(200)

I have been asked calc E & V from the equations.. I've tried sbstitution to solve it but I cannot seem to isolate any 1 of the vairables

Bailey
the first the you want to do is simplify. we'll just work on the first equation. you have $.00243=\frac{200}{E}-\frac{100V}{E}$
that can be simplified to $.00243=\frac{200-100V}{E}$
multiply both sides by E and you should be able to figure it from there! post if you need more help

3. Originally Posted by Bailey
Hi i have the following problem..

0.00243 = 200/E - V/E (100)

0.00057 = 100/E - V/E(200)

I have been asked calc E & V from the equations.. I've tried sbstitution to solve it but I cannot seem to isolate any 1 of the vairables

Bailey
Substitution isn't the onl y way to solve simultaneous equations there is elimintaion for example :

3x + 4y = 1
6x - 2y = 5

you can solve this by multiplying the 1st equation by 2 and then subtract the 1st equation with the 2nd

6x + 8y = 2
-( 6x - 2y = 5)
0x + 10y = -3
y = -3/10 ...
try this method for you question...