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Suppose that y is directly proportional to x and that y = -53 when x=5.

Find the constant of proportionality k

k=?

 

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CAROLYN H. | Math, Science, and Test Prep Professional TutorMath, Science, and Test Prep Professiona...
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y being directly proportional to x means that y = k times x = kx

given that y = -53 when x = 5, then substitute -53 for y and 5 for x which makes the equation the following: -53 = 5k

so k = -53/5