Hi! Can you please help me answer these problems and explain them? I especially do not understand how to get the equations from the variables in the problem. Thank you for your time and help.

6. [-12 Points] DETAILS WEBASSIGNIIALGZ 16.7.0063. MY NOTES Write and solve the system of linear equations described by the application and then answer the question. One hundred twenty feet of fencing encloses a rectangular garden on three sides. One side of the garden is the side of a barn and requires no fencing. The longer side is parallel to the barn. If the length of the longer side of the rectangle is twice the width, what are the dimensions of the garden? length |:|ft width |:|ft 7. [-13 Points] DETAILS MY NOTES Define your variables, write a system of equations, use your calculator to solve the system of equations and answer the problem. A grocer sells milk chocolate at $2.90 per pound, dark chocolate at $4.30 per pound, and dark chocolate with almonds at $5.90 per pound. He wants to make a mixture of 50 pounds of mixed chocolates to sell at $4.68 per pound. The mixture is to contain as many pounds of dark chocolate with almonds as milk chocolate and dark chocolate combined. How many pounds of each type must he use in this mixture? amount of milk chocolate lbs amount of dark chocolate lbs amount of dark chocolate with almonds lbs 8. [11 Points] DETAILS WEBASSIGNIIALGZ 16.7.0073. MY NOTES Write a system of linear equations that denes the verba! problem, and then answer the question. A rectangular pasture has a perimeter of 1200 feet. The pasture's length is 200 feet more than its width. What is the area of the pasture? |:|ftz