SOLUTION: can someone help me? solve the system: { x+5y-z=4 {3x+4y+z=4 { x- y+z=0 I do not understand these questions. thanks for the help.

Question 113455: can someone help me? solve the system:
{ x+5y-z=4
{3x+4y+z=4
{ x- y+z=0
I do not understand these questions. thanks for the help.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
There are 3 equations with 3 unknowns, so it should be possible
to find x, y, and z.

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add the 1st and 3rd

subtract this equation from the 2nd one

Now plug values for y and z into the 3rd equation

The answers are
x = 2
y = 0
z = -2
----------
check answers

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OK
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