On monday, 350 people bought tickets to the county fair. tickets cost $7 for
adults and $3 for children. the total revenue from ticket sales on monday was
$2050. the system of equations below represents the number of people and
total sales for the county fair on monday, where x represents the number of
child tickets and y represents the number of adult tickets.
*+ y = 350
3x+7y = 2050
how many adult tickets were sold on monday?