Question

3x+2y+z=10
x+2y+2z=11
x+y+z=6

Answer 1

3x+2y+z=10
6x=10
x=10/6 simplificando da 5/3

x+2y+2z=11
5x=11
x=11/5

3x=6
x=6/3=2

Answer 2

a) 3.1+2.1+5=10
3+2+5
10
(x=1 y=1 z=5)

b) 1+2.1.2.1=11
     3+4+4
     =11
(x=1 y=1 z=2)

c) 2+2+2=6

(x=2 y=2 z=2)