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4 = a + 2b + a + 4b
4 = 2a + 6b ... [ pers. 1 ]
U₈ = 18
18 = a + 7b
36 = 2a + 14b ... [ pers. 2 ]
Eliminasikan kedua persamaan :
2a + 6b = 4
2a + 14b = 36 -
-8b = -32
b = 4
Substitusikan nilai b = 4 ke salah satu persamaan :
2a + 6b = 4
2a + 24 = 4
2a = -20
a = -10
u5+u3=2a+6b
u18=a+17b
u36=2a+14b
2a+14b=36
2a+6b=4
__________-
8b=32
b=4
cra cr (a)
u8=a+7b=18
a+7.4=18
a=18-28
a=-10
Jd
a=-10
b=4