[tex]If\ they\ gained\ 9\ yards\ it\ as\ in\ our\ sum\ positive\ number\\\\If\ they\ lost\ 22\ yards\ it\ is\ negative\ number\ in\ our\ sum\\so\\9-22=-13\\\\Their\ overall\ lost\ was\ 13\ yards.\\\\Their\ position\ changed\ by\ 13\ yards\ negatively.(they\ go\ back)[/tex]