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pembilang = x
penyebut = y
(x+5)/(y+5) = 3/4
4 (x+5) = 3 (y+5)
4x + 20 = 3y + 15
4x - 3y = - 5 ............ (persamaan 1)
(x-3)/(y-3) = 1/2
2 (x-3) = y - 3
2x - 6 = y - 3
2x - y = 3 ............... (persamaan 2)
Kita eliminasi persamaan 1 dan 2
4x - 3 y = -5 [x1] 4x - 3y = -5
2x - y = 3 [x2] 4x - 2y = 6
-------------- -
- y = -11
y = 11
2x - y = 3
2x - 11 = 3
2x = 14
x = 7