Find the solution using substitution method: 2x-y=2 2x+y=6

Graph this system of equations and solve: 2x-3y=-4 x+2y=5

Solve this system of equations using the elimination method: x+3=y-3 2(x+3)=6-y

At a chocolate factory there are 900 bonbons packed in boxes with 6 and 12 units. How much boxes there are of each kind if there are 125 boxes?

Solve this system of equations graphically and algebraically: 2x-y=2 4x-2y=4