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Sagot :
The given system is
[tex]\begin{gathered} 5x-2y+3z=-3\rightarrow(1) \\ 2x-4y-3z=0\rightarrow(2) \\ x+6y-8z=-37\rightarrow(3) \end{gathered}[/tex]Use equation (3) to find x in terms of y and z
[tex]x=-6y+8z-37\rightarrow(4)[/tex]Substitute x in (1) and (2) by (4)
[tex]\begin{gathered} 5(-6y+8z-37)-2y+3z=-3 \\ -30y+40z-185-2y+3z=-3 \\ -32y+43z=182\rightarrow(5) \end{gathered}[/tex][tex]\begin{gathered} 2(-6y+8z-37)-4y-3z=0 \\ -12y+16z-74-4y-3z=0 \\ -16y+13z=74\rightarrow(6) \end{gathered}[/tex]Multiply (6) by 2
[tex]\begin{gathered} -32y+26z=148 \\ -32y+26z-26z=148-26z \\ -32y=-26z+148\rightarrow(7) \end{gathered}[/tex]Substitute -32y in (5) by (7)
[tex]\begin{gathered} -26z+148+43z=182 \\ 17z=182-148 \\ 17z=34 \\ z=\frac{34}{17} \\ z=2 \end{gathered}[/tex]Substitute the values of z in equation (7) to find y
[tex]\begin{gathered} -32y=-26(2)+148 \\ -32y=-52+148 \\ -32y=96 \\ y=\frac{96}{-32} \\ y=-3 \end{gathered}[/tex]Substitute the values of z and y in equation (4) to find x
[tex]\begin{gathered} x=-6(-3)+8(2)-37 \\ x=18+16-37 \\ x=-3 \end{gathered}[/tex]The solution is x = -3, y = -3, z = 2
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