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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

Respuesta :

Direct variation looks like
y=kx, so

k=y/x

(2, 4)      k=4/2=2
(5, 10)    k=10/5=2
(7, 14)    k=14/7=2
(11, 22)  k=22/11=2

Answer:A.k=2.

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