Use the graph to write a linear function that relates y to x . help please

Solve |2x - 5| = 4 if anyone could , that would be great

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.

Im literally having a mental breakdown