Jim weighs 30 lb. less than Tom, and together they weigh 210 lb. Let n = Tom's weight in pounds. Select the equation that most accurately depicts the word problem.

Ithink c hope that

  example you can find the perimeter by addig all of its respective sides as such: (12+x)+(12+x)+(7+y)+(7+y).  adding like terms will result in   2x+2y+38    if you chose  xy+7x+12y+84, you multiplied the two sides to find the area.  if you chose  x+y+19