Question

2z-3y=3
2(x-3z)=5x-15 3(-2y+x)=11+2x

metodo de substituição

Answer 1

2z -3y = 3

2x -6z = 5x -15 → -3x -6z = -15 → x +2z = 5

-6y + 3x = 11 + 2x → -6y +x = 11

(II)

x = 5 -2z

-6y +5 -2z = 11

-6y -2z = 16 /-2

3y +z = -8

z = -8 -3y

2*(-8 -3y) -3y = 3

-16 -6y -3y = 3

-9y = 3 + 16

y = -19/9

z = -8 -3*(-19/9)

z = -8 +19/3

z = (19 -8*3)/3

z = -5/3

x = 5 -2*(-5/3)

x = 5 +10/3

x = (10 +5*3)/3

x = 25/3

{25/3 , -5/3 , -19/9}