In the x*y-coordinate system, points (2, 9) and (-1, 0) lie on line k. If the po...【小站备考】

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In the x*y-coordinate system, points (2, 9) and (-1, 0) lie on line k. If the point (n, 21) lies on line k, what is the value of n?

A.6

B.7.0

C.8

D.9

E.10

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