Show me the steps to solve. In C#

Write a program that prompts the user to enter X and Y coordinates for $2$ points on the Cartesian plane. The program then calculates the slope of the line connecting these two points.

The slope of a line is the "rise" divided by the "run". Or the change in height divided by the change in width

slope $=($Y$2-$ Y$1)/($X$2-$ X$1)$

Here is a sample execution of the program. User entered values are in red.

Enter the X coordinate of the $1$st point: $-1$

Enter the Y coordinate of the $1$st point: $2\mathrm{.}3$

Enter the X coordinate of the $2$nd point: $3\mathrm{.}1$

Enter the Y coordinate of the $2$nd point: $4\mathrm{.}2$

The slope of the line connecting these two points is: $0\mathrm{.}463414$