help me please 4x+y+5z=-9 x-4y-2x+-2 2x+3y-2z=21

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help me please 4x+y+5z=-9 x-4y-2x+-2 2x+3y-2z=21

Algebra
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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Use matrix
what its a system of equations solving for 3 variables so im lost

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The second equation should be x-4y-2z =-2, right?
yes
take the third one subtract the second one, what do you get? that is (3) -(2) =??
i am trying to get rid of the x in all 3 equations so i have to set them to 0 im lost on the work
YOu lost on your way, give it a try on my way, ok? Again (equation 3 )-(equation 2) is??? You should work on it, I am guiding you only.
@kal1921 what is the matrics
Good luck.
ok i have now -2x-4y-2z=-4 2x+3y-2z=21
here, you have a system of two equations, with three unknows. We can rewrite it as below: \[\left\{ \begin{gathered} 2x + 4y = 4 - 2z \hfill \\ 2x + 3y = 21 + 2z \hfill \\ \end{gathered} \right.\] which can, easily solved for x, and y as functions of z. Please try
You get 7y-4z=16

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