The graph shows a proportional relationship between x and y. find the constant of proportionality (r) and write an equation to represent the relationship.

r=3

Step-by-step explanation:

We are given that a graph.

The graph shows  a proportional relationship between x and y.

From given graph  we can see that when x increases then y is also increases.

Therefore,

Where r=proportionality constant

x=5 and y=15

Substitute the values then we get

Substitute the value of r

Then, the equation to represent the relationship is given by