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January 29, 2015

January 29, 2015

Posted by **Max** on Saturday, November 13, 2010 at 8:06pm.

1) 3x-2y+2z=1

2) 2x+5y-5z=7

3) 4x-3y+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 8:09pmyou 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 8:13pmYou 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 8:16pmSo you would get 22x-10y=-8? how would you combine that with -5x+4y=7?

- Algebra -
**Max**, Saturday, November 13, 2010 at 8:20pmTHanks guys! i get it now!

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