Question

Resolvendo o sistema { 2x+Y-z=3  ,qual o valor de X?
                                     { Y+z=2 
                                     { 4z=8

Answer 1

 2x+Y-z=3 ==> 2x + 0 - 2 = 3 ==> 2x = 3 - 2 ==>2x= 1 ==> x = 1/2
 Y+z=2 ==> Y + 2 = 2 ==> Y = 2-2==> Y= 0
4z=8  ==> z = 8/4 ==> z =2