Hey, need some help with the methodology involved in solving simultaneous equations with three unknowns.

I1 =I2 +I3

8I1= 3I3

3I1+5I2=3.4

cheers.

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- Dec 8th 2009, 04:57 AMclaysonsimultaneous equations, 3 unknowns
Hey, need some help with the methodology involved in solving simultaneous equations with three unknowns.

*I*1 =*I*2 +*I*3

8*I*1= 3*I*3

3*I*1+5*I*2=3.4

cheers. - Dec 8th 2009, 06:42 AMcraig
First rearrange your second two equations to get them with respect to

, therefore

For the second one, do the same:

, , so .

Now put these values of and in to your first equation, you now have an equation in terms of just .

Solve this and then put your value for back into the second and third equations to find all terms.