{-7x+y=9
{x+3y=5
x=5-3y
-7(5-3y)+y=9
-35+21y+y=9
22y=44
y=44/22
y=2
x=5-3.2
x=5-6
x=-1
__________________________
{-x-y+z=15 (-1)
{3x-y+2z=10
{-2x-y+2z=15
{x+y-z=-15
{4x+z=-5 (-1)
{-x+z= 0
{-4x-z=5
{-x+z=0
-5x=5
-x+z=0
-(-1)+z=0
1+z=0
z=-1
x+y-z=-15
-1+y-(-1)=-15
-1+y+1=-15
y=-15
Espero Ajudar
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{-7x+y=9
{x+3y=5
x=5-3y
-7(5-3y)+y=9
-35+21y+y=9
22y=44
y=44/22
y=2
x=5-3.2
x=5-6
x=-1
__________________________
{-x-y+z=15 (-1)
{3x-y+2z=10
{-2x-y+2z=15
{x+y-z=-15
{3x-y+2z=10
{-2x-y+2z=15
{4x+z=-5 (-1)
{-x+z= 0
{-4x-z=5
{-x+z=0
-5x=5
x=-1
-x+z=0
-(-1)+z=0
1+z=0
z=-1
x+y-z=-15
-1+y-(-1)=-15
-1+y+1=-15
y=-15
Espero Ajudar