Does any one know how to successfully complete simulataneous equations I have been trying to solve this one for ages and just cant do it is stressing me out (Headbang)

3p1-4p1=57

2p1+2p2-10=0

I'd appreciate any help

thanks

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- Dec 4th 2008, 03:49 AMsmelly1simulataneous equations HELP!!
Does any one know how to successfully complete simulataneous equations I have been trying to solve this one for ages and just cant do it is stressing me out (Headbang)

3p1-4p1=57

2p1+2p2-10=0

I'd appreciate any help

thanks - Dec 4th 2008, 03:59 AMgreat_math
I think there is an typo..It should be

3p1-4p2=57---------[1]

2p1+2p2-10=0-------[2]

Here is the solution:

Multiply 2 in equation [2]

Now we have;

$\displaystyle 3p_1-4p_2=57---[1]$

$\displaystyle 4p_1+4p_2=20--[2]$

Add them...

$\displaystyle 7p_1=77$

$\displaystyle p_1=11$

Substitute in [1]

We have $\displaystyle -4p_2=24$

$\displaystyle p_2=-6$

So $\displaystyle p_1=11$ and $\displaystyle p_2=-6$ - Dec 4th 2008, 09:30 AMsmelly1Thankyou
Thanks for your help thats great (Happy)