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5a + 3s = 44 |x2| 10a + 6s = 88
kita kurangi persamaan tersebut
10a + 25s = 125
10a + 6s = 88 _
9s = 37
s = 37/9
kita substitusikan 2a + 5s = 25
2a + 5(37/9) = 25
2a + 185/9 = 25
2a + 185 = 225
2a = 40
a = 20
maka 4a + 10s = 4(20) + 10(37/9) = 80 + 370/9 = 720/9 + 370/9 = 1090/9 = 121,1 Rb