Using the graph to the right which region represents the solution to the system of inequality 15x + 1 +10y = 5
- 15x + 18y = 51
7x + 6y = 5
5x - y = -17
ЈУ
A
B
X
D
C

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.