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a + 7b = 19
u15 + u18 = 72
a + 14b + a + 17b = 72
2a + 31b = 72
eliminasi
2a + 31b = 72 (x 1) 2a + 31b = 72
a + 7b = 19 (x 2) 2a + 14 b = 38 _
17b = 34
b = 34/17
b= 2
substitusi
a+ 7b =19
a + 7 (2) = 19
a +14=19
a=19-14
a=5