The constant of proportionality can be calculated using any pair (x,y) and calculate the quotient y/x.
For example, we can take the first row:
[tex]k=\frac{32}{4}=8[/tex]The constant of proportionality is 8.
Then, the equation is:
[tex]y=8x[/tex]The relation 3y=24x is the same as y=8x, because:
[tex]\begin{gathered} 3y=24x \\ y=\frac{24}{3}x \\ y=8x \end{gathered}[/tex]