Plz help me with ts quston

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

The graph shows the distance y, in inches, a pendulum moves to the right (positive displacement) and to the left (negative displacement), for a given number of seconds x. how many seconds are required for the pendulum to move from its resting position and return? enter your answer in the box.

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?