Determine whether the graphs of the given equations are parallel ,perpendicular, or neither : y=5x + 13 and y = -5x+1

Rules:

If two lines have the same slope, the lines are parallel.

If two lines have slopes which are negative reciprocals of each other, the lines are perpendicular.  Example:  The negative reciprocal of 2 is -1/2.

If neither of the above conditions is true, then the lines are neither parallel nor perpendicular.

Apply these rules to the given functions.