jika x dan y memenuhi sistem persamaan 2/x + 1/y = 1 dan 2/x - 1/y = 8 maka nilai 1/x+y =

2/x + 1/y = 1
2/x - 1/y = 8
------------------ (+)
4/x = 9
1/x = 9/4

2/x + 1/y = 1
2 . 9/4 + 1/y = 1
1/y = 1 - 9/2
1/y = (2 - 9)/2
1/y = -7/2
y = -2/7

(1/x) + y = 9/4 - 2/7 = (63 - 8)/28 = 55/28