ellen loves to wear socks with crazy patterns. she finds a great deal for these kinds of socks at her favorite store, rock those socks. there is a proportional relationship between the number of pairs of socks that ellen buys, x, and the total cost (in dollars), y. x (pairs of socks) y (dollars) 4 $8 5 $10 9 $18 10 $20 what is the constant of proportionality? write your answer as a whole number or decimal. dollars per pair of so