The constant of proportionality can be obtained by:
[tex]k=\frac{y_2-y_1}{x_2-x_1}[/tex]Using the first two rows of the table we have:
[tex]\begin{gathered} k=\frac{0.75-2.25}{-1-(-3)} \\ =\frac{-1.5}{2} \\ =-0.75 \end{gathered}[/tex]Therefore, k=-0.75, this is equal to -3/4, hence the answer is B.
