Question

Tolong banget ya plisssss

Answer 1

X+ 1/2 y = 3  *kalikan 2 --> 2x + y = 6 .............(1)
1/3 y - z = -1 *kalikan 3 --> y - 3z = - 3...........(2)
1/4 x + 1/3 y = 1 *kalikan 12 --> 3x + 4z = 12....(3)
.
(1) dan (2) eliminir y
2x + y = 6
y - 3z = - 3
-----------(-)
2x + 3z = 9.....(4)
.
(3) dan (4) eliminasi
3x + 4z  =12....kalikan 2
2x + 3z= 9.......kalikan 3
.
6x + 8z = 24
6x + 9z = 27
...........(-)
-z = - 3
z = 3

6x + 8z= 24
6x + 24 = 24
6x = 0
x= 0

2x + y = 6
2(0)+y = 6
y = 6

x² - y² +z²= 0 - 36 +9 = - 27