Im being timed so please help-​

How do you use the elimination method for this question? explain, because i really want to understand!

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 in pounds, w, of the contents that liz will ship to her friend if she must use a medium flat-rate box. use the drop-down menus to explain your answer.

What is the ordered pair of m’ after point m (5, 6) is rotated 90° counterclockwise?