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2a + 3b = 14 ... [ pers. 1 ]
U₇ + U₈ = 54
2a + 13b = 54 ... [ pers. 2 ]
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a).
2a + 3b = 14
2a + 13b = 54 -
-10b = -40
b = 4
Beda = 4
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b).
2a + 3b = 14
2a + 12 = 14
2a = 2
a = 1
Suku pertama = 1
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c).
Un = a + ( n - 1 ) b
Un = 1 + ( n - 1 ) 4
Un = 1 + 4n - 4
Un = 4n - 3
Rumus suku ke - n :
Un = 4n - 3