express the simultaneous equations

Question

  -Χ + 2γ + 4Ζ = 7

 

   2Χ + γ - 2Ζ = -2

 

   -3Χ      + 2Ζ = 7

 

in the form of a matrix equation NX=C, where N is the 3×3 matrix, X and C are  suitable column matrices. Hence solve these equations by the matrix method

Answer 1

⌈-1     2     4  ⌉  ⌈x⌉        ⌈ 7⌉

   2      1     -2       y     =    -2

⌊-3     0     2  ⌋  ⌊z⌋        ⌊7⌋