Which statements give the correct constant of proportionality as y = kx?
Choose the correct answers.

1) It takes 5 cans of paint (x) to cover 10 dog houses (y).
y = 2x

2)A lawn service charges $258(y) for mowing 6 yards (x).
y = $43x

3)8 pounds of beef (x) costs $78 (y).
y = $9x

4)Beverly can reads 315 pages (y) in 7 hours (x).
y = 45x

5)10 chocolate bars ( x) contain 3,330 calories (y).
y = 333x