The answer and how to solve it

(9,5)
How I got it: Multiply 3 on the bottom equation. You will get -4x+9y=9 and 3x-9y=-18. Add both equations and you will get -x=-9. So x equals 9. Then substitute 9 into x for any equation. (I did the botto) You will get -3y=-15. So y equals 5  

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.