### Home > CC4 > Chapter 3 > Lesson 3.3.2 > Problem 3-128

3-128.

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

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

-inch chain?

Substitute

into your equation for and evaluate for.