Question

Discutir e, se possível, resolva o sistema:

x + y + z + w = 13
y - z - w = 1
5z - w = 9
3w = 3

Answer 1

3w=3>w=3/3=1
5z-w=9>5z=10>z=10/5=2
y-z-w=1>y=1+z+w>y=1+2+1=4
x+y+z+w=13>x=13-y-z-w>x=13-4-2-1=6