Question

1) x + 4y = 20
2x + 5y + 4z = 20
2x - 2y + 3z = -6

Answer 1

the correct answer to this equation is: 124/27

Answer 2

x= 124/27

y= 104/27

z= -26/27

Explanation:

To solve the system, rewrite it as two systems each consisting of two

`\left \{ {{x+4y=20} \atop {x+5y+4z=20}} \right.`

`\left \{ {{x+5y+4z=20} \atop {2x-2y+3z=-6}} \right.`

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