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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. What are the units for slope and y‑intercept for your equation?

    Eyeball a line of best fit. Then estimate the slope and -intercept of your line.

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

  • Substitute into your equation for and evaluate for .

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.