# simulataneous equations HELP!!

• Dec 4th 2008, 03:49 AM
smelly1
simulataneous 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 AM
great_math
Quote:

Originally Posted by smelly1
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

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]\$

\$\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 AM
smelly1
Thankyou
Thanks for your help thats great (Happy)