Question 673798
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
x-3y+2z=-6
<u>2x+5y-4z=6</u>
{{{4x-y = -6}}}
2x+5y-4z=6
<u>3x-4y+12z=-5</u>
 {{{9x+11y = 13}}}

4x  -y = -6
<u>9x + 11y = 13</u>
 53x = -53
   x = -1, y = 2  and z = 1/2  {{{-1-6 +2z = -6}}}