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= 2a + 11b = 29
u3 = a + 2b = 18....(masing2 kali 2)
2a + 4b = 36
u5+u8 = 2a + 11b = 29 -
-7b =7
b =-1
a + 2b = 18
a - 2 = 18
a= 20
u31 = a + 30b
= 20 + 30 (-1)
= 20 - 30
= -10
U5 = a + 4b
U8 = a + ( 8-1 ) b
U8 = a + 7b
U5 + U8 = 29
a + 4b + a + 7b = 29
2a + 11 b = 29.......... Persamaan 1
U3 = a + ( 3-1 ) b
18 = a + 2b
a = 18 - 2b ...... Persamaan 2
( Subsitusikan persamaan 2 ke persamaain 1 )
2a + 11b = 29
2(18 - 2b ) + 11b = 29
36 - 4b + 11b = 29
7b = 29-36
7b = -7
b = -7/7
b = -1
a= 18 - 2b
a= 18 -2 * -1
a = 18 + 2
a = 20
U30 = a + (30-1)b
U30 = 20 + 29 * -1
U30 = 20 - 29
U30 = -9