Posted by Max on Saturday, November 13, 2010 at 8:06pm.
Solving systems of linear equations in 3 variables...
1) 3x2y+2z=1
2) 2x+5y5z=7
3) 4x3y+z=3
I combined 1 and 3 to get 5x+4y=7
And then i combined 2 and 3 to get
13y+11z=17. Can that be right? how would you combine those two equations?

Algebra  bobpursley, Saturday, November 13, 2010 at 8:09pm
you should when combining 2 and 3, multiply to get rid of z, so multiply 3 by 5, then add.

Algebra  Reiny, Saturday, November 13, 2010 at 8:13pm
You would like to have the same two variables in the two new equations.
Your first one contains x and y, but your second contains y and z. This gets you nowhere.
Your first equation is ok,
Now take 5 times the third and add it to the second.

Algebra  Max, Saturday, November 13, 2010 at 8:16pm
So you would get 22x10y=8? how would you combine that with 5x+4y=7?

Algebra  Max, Saturday, November 13, 2010 at 8:20pm
THanks guys! i get it now!
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