What is the constant of proportionality in this proportional relationship?
x: 2, 2 1/2, 3, 3 1/2
y: 5/2, 25/8, 15/4, 35/8
A4/5
B5/4
C4
D5
x: 2, 2 1/2, 3, 3 1/2
y: 5/2, 25/8, 15/4, 35/8
A4/5
B5/4
C4
D5