tolong di jawab yah!!!!

Misal :
1/x = a
1/y = b
1/z = c

(1) 2a + 2b - 4c = 2
(2) 3a - 2b + 5c = 10
(3) 4a + 5b - 3c = 17

Jumlahkan persamaan (1) dan (2)
5a + c = 12 ... (4)

persamaan (2) kalikan 5
persamaan (3) kalikan 2
15a - 10b + 25c = 50
8a + 10b - 6c = 34
Jumlahkan
23a + 19c = 84 ... (5)

Persamaan (4) kalikan 19
95a + 19c = 228
23a + 19c = 84
Kurangkan
72a = 144
a = 2 ---> x = 1/a = 1/2 ✔

5a + c = 12
5.2 + c = 12
c = 2 ---> z = 1/c = 1/2 ✔

2a + 2b - 4c = 2
a + b - 2c = 1
2 + b - 4 = 1
b = 3 ---> y = 1/b = 1/3 ✔