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U5 = a + 4b = 31
a + 2b = 17
a + 4b = 31
(dieliminasi; dikurangi)
jadi -2b = -14
b = 7.
a + 2b = 17
a + 2 dikali 7 = 17
a + 14 = 17
a = 3.
U30 = a + 29b
= 3 + 29 dikali 7
= 3 + 203
= 206
a+2b = 17...(1)
u5 = a+4b
a+4b = 31...(2)
eliminasi (1) dan (2)
• a+2b = 17
• a+4b = 31
-------------- -
••• -2b = -14
••• b = 7
u3 = a+2b
17 = a+2(7)
17 = a+14
a = 17-14
a = 3
• u30 = a+(30-1)b
• u30 = a+29b
• u30 = 3+(29)7
• u30 = 3+203
• u30 = 206