Question

3x-4y-6z=14 2x-8y +2z=15 3x+4y+6z=16

Answer 1

3x-4y-6z=14 (1)

2x-8y +2z=15 (2)

3x+4y+6z=16 (3)

(1)+(3),

6x=30

x=5

代入(1),(2)

15-4y-6z=14 (4)

10-8y +2z=15 (5)

(4)×2-(5),

20-14y=13

z=1/2

x=5,z=1/2代入(1),

15-4y-3=14

y=-1/2

x=5,y=-1/2,z=1/2