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Un = an + b
-9 = 6a + b
-6 = 5a + b —
-----------------
-3 = a
-6 = -15 + b
b = 9
Rumus = Un = -3n + 9
U10 = -3.10 + 9
U10 = -30 + 9
U10 = -21
2 ) Aritmatika
Un = a + (n-1) b
a = ?
b = -9 - (-5) = -3
-6 = a + (5-1) -3
-6 = a - 15 + 3
-6 = a - 12
a = -6 + 12
a = 6
Rumus = Un = 6 + (n-1) -3
U10 = 6 + (10-1) -3
U10 = 6 - 30 + 3
U10 = -21
Semoga membantu. Kamu bisa milih salah satu rumus, tidak perlu keduanya ^^