Identify a transformation of the function f(x)=1/x by observing the equation of the function g(x)=1/x-16

(a) a vertical shift 16 units upward.
(b) a vertical shift 16 units downward.
(c) a horizontal shift 16 units to the right.
(d) a horizontal shift 16 units to the left.

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?