The graph at right shows a comparison of the length of several gold chain necklaces (including the clasp) to the total mass. 

1. Write an equation for the line of best fit.

   Hint (a):

   Hold a straight-edge up to the graph to create a line and estimate the slope and $y$-intercept.

   Answer (a):

   $y = x + 2$ is one possibility.

2. Based on your equation, what would you expect to be the mass of a $26$ inch chain?

   Hint (b):

   Use the rule you wrote in part (a).
   Which variable represents mass, $x$ or $y$?

   Answer (b):

   About $28$ grams.