There are 9cans that can store 45 tennis balls what is the constant of the proportionality for this situation

Let the total number of cans be x and the total number of tennis balls be y,

Since increasing the total number of cans causes the total number of tennis balls to increase too, x and y is direct in proportion.

Let the constant be k,

y = kx

45 = k9

k = 45/9

= 5

The constant of the proportionality for this situation is 5.