PLZ IM ON A TEST AND HAVE 2 MIN LEFT Which equation does NOT represent a direct variation?
1.-3x+2y=0
2.-2y=x
3.y=50x
4. 5x+2y=10

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.