270 cm of snow in 18hours

Answer this 30 points and brainliest!

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.

X2 + y 2 = 36 x + y = 6 solve the system of equations.