Find the constant of proportionality k, and write the linear function relating the two variables.Suppose that y varies directly with x. When x = 6, then y = 54.
A. k = 48; y = x + 48
B. k = 6;y = 6x
C. k = 
; y = 
x
D. k = 9; y = 9x
Answer: D
Mathematics
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