which rule describes the composition of transformations that maps δabc to δa"b"c"? translation of negative 6 units x, negative 2 units y composition reflection across the x-axis reflection across the x-axis composition translation of negative 6 units x, negative 2 units y translation of negative 6 units x, negative 2 units y composition 90 degree rotation about point 0 90 degree rotation about point 0 translation of negative 6 units x, negative 2 units y