Question 914583
-x+2y-4z=5 
<u> x+4y-6z=-1</u>
 {{{6y - 10z = 4}}}
.......
2x-y+2z=7 
<u>2(-x+2y-4z=5)</u> 
{{{ 3y -6z = 17}}}
.........
6y - 10z = 4
<u>-2(3y-6z = 17</u>
2z = -30
z = -15 , y = {{{-146/6}}}, x = compute...
(19/3, -73/3, -15) is the solution for this System