Given that the x-variable indicates weight (in pounds) and the y-variable indicates cost (in dollars), the coordinates for each store are:
Store C: (3, 6)
Store B: (6, 9)
Connecting these two points with a line, we get:
Stores B and C ratios are computed as follows:
[tex]\begin{gathered} \text{ Store C ratio =}\frac{\text{ cost in \$}}{\text{ weight in pounds}}=\frac{6\text{ \$}}{3\text{ pounds}}=2\frac{\text{\$}}{\text{pound}} \\ \text{Store B ratio =}\frac{\text{ cost in \$}}{\text{ weight in pounds}}=\frac{9\text{ \$}}{6\text{ pounds}}=1.5\frac{\text{\$}}{\text{pound}} \end{gathered}[/tex]
Given that the ratios are different, then they are not proportional.
