18. when y = x? , which of the following expressions is
equivalent to -y ?

What term best describes a line ans a point that lie in the same plane

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.

How do i do this activity, is appreciated