Respuesta :
6r+7y=total feet is the equation you use. Then you plug in 10 for r and 7 for y to get:
6(10) + 7(7) = total feet
then you get
60+49= total feet
then
109=total feet
6(10) + 7(7) = total feet
then you get
60+49= total feet
then
109=total feet