PLEASE HELP!! Sean's father decided that the number of hours Sean should study daily is equal to the equation y+ 2x = 13, where y is the number of study hours and r is the number of relaxation hours. Sean's mother believes that the number of hours Sean should study daily should be equal to the equation 2y +16x=77 both equations to determine the number of hours Sean should study and relax. What is an equivalent equation to the addition of Sean's mother's equation and Sean's father's equation? Select all that apply. = 77. Sean's parents have decided to use