The following set of ordered pairs is an example of direct variation, find the constant ratio between the variables. (Hint: Find k.)

(2, 4) (5, 10) (7, 14) (11, 22)

A. k=2

B. k=8

C. k=-2

D. k = 1/2

Solve for the variable. x - 2/7=9/7

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