Lines a b and c show proportional relationships which line has a constant of proportionality between Y and X of 1

Strawberries cause two hours per pound kate buys 5 pounds he gets 20% off discount on the total cost how much does kate pay for the strawberries

The table represents a function f(x). what is f(3)? a.-9 b.-1 c.1 d.9

Julie goes to the sports store and spends $40.50 before tax. she buys a pair of shorts for $21.75 and 3 pairs of socks that each cost the same amount. how much does each pair of socks cost? $$