Hi there! :)
[tex]\large\boxed{\text{H. 2.19}}[/tex]
Let x = number of pounds of grapes and y = cost in dollars:
Find the constant of proportionality by finding the price per pound:
[tex]\frac{6.57}{3} = \frac{c}{1} \\\\2.19 = c[/tex]
Therefore, the constant of proportionality is H. 2.19
