Find the constant of proportionality k, and write the linear function relating the two variables.Suppose that Q varies directly with x and inversely with y. When Q = 3, x = 21 and y = 63.
A. k = 9; Q = 
B. k = 
; Q = 
C. k = 7; Q = 
D. k = 9; Q = 
Answer: A
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