Pentagon pqrst and its reflection, pentagon p'q'r's't', are shown in the coordinate plane below: pentagon pqrst and pentagon p prime q prime r prime s prime t prime on the coordinate plane with ordered pairs at p negative 4, 6, at q negative 7, 4, at r negative 6, 1, at s negative 2, 1, at t negative 1, 4, at p prime 6, negative 4, at q prime 4, negative 7, at r prime 1, negative 6, at s prime 1, negative 2, at t prime 4, negative 1. what is the line of reflection between pentagons pqrst and p'q'r's't'?