What is the constant of proportionality in the equation: y=5.1x

Complete the statements about the system of linear equation respresented by the tables the equation respented the left table is

What value of x will make the triangles similar by the sss similarity theorem?

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.