1. How can you tell by looking at each graph that a proportional relationship exists between the quantities? 2. Find the constant of proportionality for each graph. Write your answer as y = kx.

1. How can you tell by looking at each graph that a proportional relationship exists between the quantities? relationship can be represented by the graph of a straight line through the origin with a slope equal to the unit rate. For each point (x, y) on the graph, ž is equal to k, where k is the unit rate. The point (1, k) is a point on the graph.2. Find the constant of proportionality for each graph. Write your answer as y = kx.y = kx or y = k/x, where k determines how the two variables are related to one another. This k is known as the constant of proportionality.hope it helps