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Verified answer
Bedaa + 9b = 43
a + 5b = 23
—————— [-]
4b = 20
b = 20/4
b = 5
Suku Pertama
a + (5-1)b = 23
a + 4b = 23
a + 4(5) = 23
a + 20 = 23
a = 23 - 20
a = 3
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Verified answer
Un = a + (n-1)bU₅ = 23
a + (5-1)b = 23
a + 4b = 23
4b = 23 - a......pers 1
U₉ = 43
a + (9-1)b = 43
a + 8b = 43
a + 2(4b) = 43... substitusikan pers 1
a + 2(23-a) = 43
a + 46 - 2a = 43
-a + 46 = 43
-a = 43 - 46
-a = -3
a = 3
suku pertama (U₁) = a = 3