answer:
x= 124/27
y= 104/27
z= -26/27
Step-by-step explanation:
To solve the system, rewrite it as two systems each consisting of two
[tex]\left \{ {{x+4y=20} \atop {x+5y+4z=20}} \right.[/tex]
[tex]\left \{ {{x+5y+4z=20} \atop {2x-2y+3z=-6}} \right.[/tex]
solve the system
-y-4z=0
7y+z=26
y= 104/27
z= -26/27
substitute the given value of y into the equation x+4y=20
x+4*104/27=20
x= 124/27
