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U5 = 26 = a + 4b = 26
U3 + U6 = a + 2b + a + 5b = 2a + 7b = 46
a + 4b = 26
2a + 7b = 46
2a + 8b = 52
2a + 7b = 46
b = 6
a = 2
U10 = a + 9b = 2 + (6×9) = 2 + 54 = 56
u3+U6=46
U5= a+4b=26
U3+U6= (a+2b)+(a+5b)=46
=2a+7b=46
eliminasi-----> 2a+7b=46 | x1 | 2a+7b=46
a+4b=26 | x2 | 2a+8b=52 _
-b=-6
b=6....bedanya 6
subtitusikan---->a+4(6)=26
a+24=26
a=26-24 = 2
suku pertamanya 2
U10=2+(10-1)6
=2+(9)6
=2+54
=56