Developments in technology have allowed scientists to conclude that earth more than 4.5 billion years old. why was the discovery of "limitless time" so important to the study of geology and to the study of evolution?

The discovery of it was so important to the study of geology and the study of Evolution because before that, researchers could only determine the relative orders of rock unit and fossils. They can only estimate the length of time involved , but failed to provide any further  information

hope this helps

Alinear relationship would look like a straight line on the graph. it could have a positive negative or 0 slope. so it could be a line potentially going in any direction but it must be perfectly straight.