Respuesta :

jaylaisthe

Answer: 1. x=−7+5y+4z,   y=7/5+x/5−4z/5,  z=7/4+x/4−5y/4

2. x=−1−10y−4z         y=−1/10−x/10−2z/5       z=−1/4−x/4−5y/2

3. x=−5−8y−4z          y=−5/8−x/8−z/2            z=−5/4−x/4−2y

Step-by-step explanation: