Question

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

Answer 1

Use matrix

Answer 2

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

Answer 3

@hartnn

Answer 4

@LazyBoy
@hba

Answer 5

@chainedecho

Answer 6

The second equation should be x-4y-2z =-2, right?

Answer 7

yes

Answer 8

take the third one subtract the second one, what do you get? that is (3) -(2) =??

Answer 9

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

Answer 10

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.

Answer 11

@kal1921 what is the matrics

Answer 12

Good luck.

Answer 13

ok i have now
-2x-4y-2z=-4
2x+3y-2z=21

Answer 14

@Michele_Laino

Answer 15

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

Answer 16

You get 7y-4z=16