This graph shows a proportional relationship.
What is the constant of proportionality?

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Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?