Question

resolva o sistema: x+2y-z=7
y+4z=13
3z=9

Answer 1

Boa noite

3z= 9 -> z= 9/3 --> z= 3

y+4z= 13
y+4(3)= 13
y= 13-12
y= 1

x+2y-z= 7
x+2(1)-3=7
x= 7-2+3
x= 8