Solve the system by elimination
⎧
⎪-2x+2y+3z=0
⎨-2x-y+z=-3
⎪2x+3y+3z=5
⎩

It should be a or d i’m not sure

This is a robot. try again lol. maybe you attached the wrong image.

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.