Respuesta :

hydrgn
a = 2b + 6 — (1) [given]
a = 9b - 8 — (2) [given]

a = a
sub. in the eqns (1) and (2)
2b + 6 = 9b - 8

collect like terms :
6 + 8 = 9b - 2b
14 = 7b
b = 2