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Verified answer
U2 = a + b = 5 ••• (1)U4 + U6 = 28
a + 3b + a + 5b = 28
2a + 8b = 28
------------------- :2
a + 4b = 14 ••• (2)
a + b = 5
a + 4b = 14
---------------- -
-3b = -9
b = 3
a + b = 5
a + 3 = 5
a = 2
Maka,
U9
= a + 8b
= 2 + 8(3)
= 2 + 24
= 26
a+3b+a+5b=28
》2a+8b=28
Eliminasi menjadi
6b=18
b=3
Subtitusi
a=5-3=2
》U9=a+(n-1)b
=2+8×3
=2+24=26