Answer: 5
Step-by-step explanation:
Let k be the constant of variation for this relation.
If y varies directly as x, then the equation of direct variation is given by ;-
[tex]y=kx[/tex], where k is the constant of variation for the relation.
[tex]\Rightarrow\ k=\dfrac{y}{x}[/tex]
Now, for the given value of y = 20 and x=4, the value of constant of variation is given by :-
[tex]\Rightarrow\ k=\dfrac{20}{4}=5[/tex]
Hence, the value of constant of variation for this relation k = 5.
