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aₓ = a₁ + (x-1)r
aₓ= termino de lugar x
a₁ = primero termino
r=razon
a₃ = a₁ + (3-1)r a₆ = a₁ + (6-1)r
22= a₁ + 2r 43 = a₁ + 5r
r = (22-a₁)/2 r = (43-a₁)/5
Ahora igualamos :
(22-a₁)/2 = (43-a₁)/5
Multiplicamos todo por 10 ; para no trabajar con fracciones , y nos quedaria asi :
5(22-a₁) = 2(43-a₁)
110 - 5a₁ = 86 - 2a₁
110 - 86 = 5a₁-2a₁
24 = 3a₁
a₁ = 8