Which representations shows a proportional linear relationship between x and y?
Figure !
Figure 11
Figure III
y
y = -2x
-5
- 10
-2
-4
0
0
3
6
A. Figure II only
C. Figure I, II, and III
B. Figure I and Figure III
D. Figure I and Figure II

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.

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