Point \blue{a}astart color blue, a, end color blue is at \blue{(-4, 8)}(−4,8)start color blue, left parenthesis, minus, 4, comma, 8, right parenthesis, end color blue and point \purple{m}mstart color purple, m, end color purple is at \purple{(1, 7.5)}(1,7.5)start color purple, left parenthesis, 1, comma, 7, point, 5, right parenthesis, end color purple. point \purple{m}mstart color purple, m, end color purple is the midpoint of point \blue{a}astart color blue, a, end color blue and point \green{b}bstart color green, b, end color green. what are the coordinates of point \green{b}bstart color green, b, end color green?