Write an equation that relates the number of tennis balls (y), with the number of cans (x). (Do not put spaces between numbers, variables, and operations)

Answer:
y = 3x
Step-by-step explanation:
Since, line given in the graph passes through origin (0, 0), relation between the number of tennis balls (y) and the number of cans (x) will be proportional.
y ∝ x
y = kx
Here 'k' = proportionality constant
Since the given line is passing through (1, 3),
3 = k(1)
k = 3
Therefore, equation of the line will be,
y = 3x