kayla234566 kayla234566 18-10-2022 Mathematics Answered 5. Write an equation to show that y is directly proportional to x using the constant of proportionality given. Then, solve for the unknown value. a. k = 0.7 and y = 4 c. k = 5 and x = 11/2 b. k = ₁ and x = 9 d. k = 1 and y = 33