Five less than thw product of 3 and a number is 8

How do i do this activity, is appreciated

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.

How do you determine whether a relationship represented as as graph is linear or nonlinear