Suppose y varies directly as x. If y = 7 when x = 28, what is the value of x when y = 3?a.7b.9c.12d.16

Ok jnibinubu y y y buy un u ibubibibu

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.