please help me solve the system of equations using a martix
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Given x+2y-7z=-2..........(1)
-2x-5y+2z=1.........(2)
3x+5y+4z=-9..........(3)

Add equation (2) and (3)
-2x-5y+2z=1
3x+5y+4z=-9
..............
x+6z=-8.....(4)

Multiply by 5 in eqution (1) and multiply by 2 in equation (2)
5x+10y-35z=-10
-4x-10y+4z=2
...............
x-31z=-8.......(5)

From equation (4) and (5)
z=0

Subsitute z value in equaTION (4)
X=-8

And substitute x and z value in equation (1)
y=3


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