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2b + 3t = 14 ec. 2
De la ec. 1:
b = 6-t ec. 3
Sustituyendo valores de la ec. 3 en la ec. 2:
2*(6-t) + 3t = 14
-2t+12+3t = 14
t = 14-12
t = 2
De la ec. 3:
b = 6-t
b = 6-2
b = 4
Comprobémoslo en la ec. 2:
2b + 3t = 14
2*4 + 3*2 = 14
8+6 = 14 comprobado
Por tanto:
4 de tus primos tiene bicicleta.
Saludos...........