Respuesta :

1) D 
f(8)=8*a 
12=8*a 
a=12/8=3/2 

2) D 
f(8)=8*a 
56=8*a 
a=56/8=7 
f(2)=7*2=14 

3) y=6/x
Let f(x) = kx

f(8) = 56
⇒ k * 8 = 56
⇒ k = 56/8 = 7

thus f(x) = 7x

f(2) = 7 * 2 = 14

Answer is D.

Hope it helps!