Can someone explain this ? Please

What is the equation of this graphed line? enter your answer in slope-intercept form in the box.

Ineed in figuring out this problem.

Graph g(x)=2cosx . use 3.14 for π . use the sine tool to graph the function. graph the function by plotting two points. the first point must be on the midline and closest to the origin. the second point must be a maximum or minimum value on the graph closest to the first point.