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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.

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

    is one possibility.

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

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

    About grams.

A scatterplot for length in inches on the x axis and mass in grams on the y axis where the points are clustered  follow a line from left to right. Your teacher will provide you with a model.