Respuesta :

The function represented by the table is linear function
and pass with (0,0)
so it is in the form
             f(x) = m x
where m is the slope

m = [ f(x₂) - f (x₁) ] / [ x₂ -x₁]
    (4-0)/(1-0) =4
so
   f(x) = 4 x