Abstract
This paper is dedicated to the importance of mathematical models and their application to the solution of real world problems. The purpose of this paper is to demonstrate how the relationship between two variables or factors can be mathematically expressed. I selected the following variables: the unemployment rate and violent crime rate of the United States of America. The three points selected are the unemployment and violent crime rate in 1998-2000. The linear equation was created on the basis of two points in 1998 and 2000. He equation shows that there is a positive relationship between the number of ...