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U3+U5=a+2b+a+4b=-8
=2a+6b=-8
U8=a+7b=-16
mencari a dan b,,,,,,,,
U3+U5=2a+6b=-8 x1
U8 =a+7b =-16 x2
U3+U5=2a+6b=-8
U8 =2a+14b=-32
—————————— —
-8b = 24
b = -3
U8=a+7b=-8
=a+7.-3=-8
=a-21=-8
=a=-8+21
=a=-13
suku pertama = a = -13
semoga membantu,mohon maaf klo salah.silahkan dicek lagi soalnya sy gk pakai orek orek'an (kalkulator)
U8 = - 16 >>>>>>> a + 7b = -16
2a + 6b = - 8 | x 7| = 14a + 42b = - 56
a + 7b = - 16 | x 6| = 6a + 42b = -96
----------------------- -
8a = - 40
a = - 5
jadi suku pertama adalah - 5