Determine if the given equations are functions or not functions. x = 3
Functions
Not Functions
x² + y² = 81
y = -x + 11
y² = -5x – 12
y = 2x2 - 6x + 4
y = -7

PLEASE HELP FAST ILL MARK BRAINLEST!!!

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.