penyelesaian dari 2/y - 3/y = 1/4 dan 3/x + 4/y =2 1/2, maka x + y ?

* 2/y - 3/y = 1/4
-1/y = 1/4
y = -1 . 4
y = -4

* 3/x + 4/y = 2 1/2
3/x + 4/y = 5/2
3/x + 4/-4 = 5/2
3/x -1 = 5/2
3/x = 5/2 + 2/2
3/x = 7/2
(7/2) x = 3
x = 3/(7/2)
x = 3 . 2/7
x = 6/7

= x + y
= 6/7 + (-4)
= (6/7) - 4
= (6/7) - (28/7)
= - (22/7)