The distance D between a fixed spring and the floor is a linear function of the weight w attached to the bottom of the spring. The spring is 12 inches from the floor when the weight is 2 grams, and the spring is 7 inches from the floor when the weight is 4 grams. Write D as a linear function of w.

• D=(20/w)+2
  
  As D is the function inversely related to weight 'w' .
  With the use of some constant 'y', from the given data,we can write two eqn. as
  12=(x/2)+y ---(i) &
  7=(x/4)+y ---(ii)
  On solving (i) & (ii), x=20, y=2
  So D=(20/w)+2
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