# Help solving the following system of equations by using the inverse of the coef

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• Oct 1st 2012, 06:08 PM
Niaboc
Help solving the following system of equations by using the inverse of the coef
I don't get this at all please help

7x - y + 7z = -10
8y+7z = 17
-7x+4y+6z = 6

I know i have to set something up like [a]^-1 [b] in the Ti but i am just having a ton of confusion here...
• Oct 1st 2012, 06:14 PM
Prove It
Re: Help solving the following system of equations by using the inverse of the coef
Quote:

Originally Posted by Niaboc
I don't get this at all please help

7x - y + 7z = -10
8y+7z = 17
-7x+4y+6z = 6

I know i have to set something up like [a]^-1 [b] in the Ti but i am just having a ton of confusion here...

Yes, you need to set up \displaystyle \begin{align*} \left[ \begin{matrix} \phantom{-}7 & -1 & 7 \\ \phantom{-}0 & \phantom{-}8 & 7 \\ -7 & \phantom{-}4 &6 \end{matrix} \right]^{-1} \left[ \begin{matrix} -10 \\ \phantom{-}17 \\ \phantom{-}6 \end{matrix} \right] \end{align*}
• Oct 1st 2012, 06:26 PM
Niaboc
Re: Help solving the following system of equations by using the inverse of the coef
When i got to that point i was lost because it gave me these long decimals my TI-83 is damaged so i couldn't see the answer....is it possible you could show me the fraction in the three part form.