Figure abcd is reflected across the y-axis. what are the coordinates of a' , b' , c' , and d' ? enter your answer in each box. a' ( , ) b' ( , ) c' ( , ) d' ( , ) coordinate plane. the horizontal axis ranges from negative 10 to 10 in increments of 1. the vertical axis ranges from negative 10 to 10 in increments of 1. quadrilateral a b c d has vertices a at negative 1 comma 4, b at negative 5 comma 8, c at negative 5 comma 4, and d at negative four comma 2.