Question

Bantu... dongggg..
carikan himpunan penyelesaiannya!!!

Answer 1

2x+y+6z= -9
8x-y-z=34
-x+2z+15y=5

2x+y+6z= -9
8x-y-z=34
__________+
10x+5z=25
; 2x+z=5

2x+y+6z= -9 }×15
-x+15y+2z=5 }×1

30x+15y+90z= -135
-x+15y+2z=5
______________-
31x+88z= -140

2x+z=5 }×31
31x+88z= -140 }×2

62x+31z=155
62x+176z= -280
______________-
-145z=435
z= -87/29
z= -3

2x+z=5
2x=5-(-3)
x=4

8x-y-z=34
8×4-y-(-3)=34
-y=34-35
y= -1


Hp (4,-1,-3)