Question 412025
  <pre><font size = 3 color = "indigo"><b>
Hi
x+y=3
 4y=12
7x+3y-4z=5 

D = {{{matrix (3,3, 1,1,0,0,4,0,7,3,-4)}}} = -16

D[x]= {{{matrix (3,3, 3,1,0,12,4,0,5,3,-4)}}}= 0

D[y]= {{{matrix (3,3, 1,3,0,0,12,0,7,5,-4)}}} = -48

D[z] ={{{matrix (3,3, 1,1,3,0,4,12,7,3,5)}}} =  -16
  x = 0 and y = -48/-16 = 3 and z = -16/-16 = 1