Răspuns :
x+2y =17
2y+3z=40
_____________
x+4y+3z=40+17
x+4y+3z=57
2x+8y+6z = 2(x+4y+3z) =
2 * 57 = 114
2y+3z=40
_____________
x+4y+3z=40+17
x+4y+3z=57
2x+8y+6z = 2(x+4y+3z) =
2 * 57 = 114