Help me with these questions (picture) Plsss I will reward brainliest and points

The table respent two linear functions the equation respented by the first tables is given

Miss henderson wants to build a fence around a rectangular garden in her backyard in the scale drawing the perimeter of the garden is 14 in of the actual length of a b is 20 ft how many feet of fencing what you need

Math i have no idea how to do a and b