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U16 = a + 15b = 44 (persamaan 2)
selesaikan dengan eliminasi
a + 6b = 8
a + 15b = 44 -
- 9b = - 36
b = - 36 : (-9)
b = 4
subtitusikan ke persamaan 1 ===> a + 6b = 8
a + 6(4)=8
a + 24 = 8
a = 8 - 24
a = - 16
U20 = a + 19b = - 16 + 19(4) = -16 + 76 = 60