Solve the system of equation 2x + y = -4 and 5x – 3y = 1 by the method of elimination​

Data set:
Junior: 0,0,10,10,10,15,15,20,20,20
mean: ((0x2)+(10x3)+(15x2)+(20x3))/10 = 30 + 30 + 60 /10 = 120/10 = 12
median: (10+15)/2 = 25/12 = 12.5
mode: 10, 20
range: 20 - 0 = 20

Senior: 0,0,0,0,10,10,10,10,20,20
mean: ((0x4)+(10x4)+(20x2))/10 = 40 + 40 / 10 = 80/10 = 8
median: (10+10)/2 = 20/2 = 10
mode: 0,10
range: 20 - 0 = 20

1.the range of hours worked is the same for juniors and seniors. It is 20.