Cuantos titulares de 5 futbolista pueden hacerse con 4 jugadores si cada jugador debe jugar en su posición respectiva​

The system of equations graphed below has how many solutions? y = 2x + 2

Data was collected on myrtle beach for 11 consecutive days. each day the temperature and number of visitors was noted. the scatter plot below represents this data. how many people visited the beach when the temperature was 84 degrees?

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?