How to solve 2x+3y=9 and -4x-6y=-18

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.

What is a graph with a never ending line called?

It says factor each expression completely 8y+48