Asystem of equations is graphed on the coordinate plain y=-2x-4 y=2x+4, what is the solution to the system of equations, enter the coordinates of the solution in the boxes

The line plot below represents the number of letters written to overseas pen pals by the students at the waverly middle school.each x represents 10 students. how many students wrote more than 6 and fewer than 20 letters. a.250 b.240 c.230 d.220