Question

Which point is on the graph of a direct variation equation in which k = 1.8?

Answer 1

Y = kx
so
k = y/x

 (4, 0.45)  ; 0.45 / 4 = .1125 ...NO
 (7.2, 4)    ; 4 / 7.2 = 0.5556(5 repeat)...NO
 (4, 7.2)    ; 7.2 / 4 = 1.8 ...YES
(0.45, 4)   ; 4 / 0.45 = 8.89(8 repeat) ....NO

answer
C. (4, 7.2)

Answer 2

Yes, this answer is 7.2.
I wanted to give a second hand answer for others who want to be 100% sure.