Answer
$( -2, -1, 0)$
Work Step by Step
Write the augmented matrix and,
using row transformations arrive at the reduced row echelon form.
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It was suggested to use technology for some problems...
Syntax for matrix input:
A:={{0.25, -0.5, 0, 0},{0.2, 0.2, -0.2, -0.6},{ 0.5, -1.5, 1, 0.5}}
In the input box, begin typing "Red..."
select the function:
ReducedRowEchelonForm(A)
(see screenshot)
Solution: $( -2, -1, 0)$