Solve the system of equations below by substitution y equals x to the second power +6x plus 9 y equals negative x +3

Question 5 spring semester final exam math evaluate

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.

What is coefficient of the term of degree of degree 5 in the polynomial below