Question

An archaeologist dates a bone fragment discovered at a depth of 4 feet as approximately 1500 B.C. and dates a pottery shard at a depth of 8 feet as approximately 2100 B.C. Assuming that there is a linear relationship between depths and dates at this archeological site, find the equation that relates depth to date. How deep should the archaeologist dig to look for relics from 3000 B.C.?

Answer 1

so we can set up a linear relationship between depth and time.
use points
( t year , depth in feet)

Answer 2

usually time is considered an independent variable