Direct variation

The cost y of movie tickets varies directly with the number of tickets x as shown in the graph.

Write a direct variation equation in the form y = kx to represent this relationship.

Write a direct variation equation to represent the relationship.

The cost of paper y varies directly with the number of reams bought x. Suppose two reams cost $5.10.

Write a direct variation equation in the form y = kx to represent this relationship. Express the constant of variation as a decimal.

The amount of flour needed for a recipe y varies directly with the number of servings planned x. Three servings require 4.5 cups of flour.

Write a direct variation equation in the form y = kx to represent this relationship.