persamaan 1/× + 1/y= 10 dan 2/x - 2/y =26 ?

Cari x dan y nya?
Misalkan,
1/x + 1/y = 10 ...(1)
2/x - 2/y = 26 ...(2)

(1) dikali 2,
2/x + 2/y = 20 ...(1)'

(2)+(1)',
4/x = 46
x = 4/46
x = 2/23

Substitusikan x = 2/23 ke (1),
23/2 + 1/y = 10
1/y = 10 - 23/2
1/y = 20/2 - 23/2
1/y = -3/2
2=-3y
y=-2/3

Semoga benar ya