Which graph represents a system of equations with one solution?
On a coordinate plane, 2 lines intersect at 1 point.
On a coordinate plane, 2 lines are parallel to each other.
On a coordinate plane, a line has a positive slope.
On a coordinate plane, 2 lines are parallel to each other.

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.

Basic algebra equation. first set up your equation: divide out 9.and now you are left with 2x + 4 = 8.