please help!✌︎︎♪
it would be appreciated!!!♡︎♡︎♡︎♡︎♡︎♡︎

Answer:
Input value/x = 9
Step-by-step explanation:
The output value means y and the input value means x.
So they've told us the output value y = 4.5
Sub this into the function they gave us to get x
y=x/2
4.5=x/2
9=x