Exercise $3$

Write a Python program that uses the coordinates $(x,y)$ of $2$ points to find and display the equation of the line $y=mx+c$ that goes over the $2$ given points. $m$ is called the slope: $m=\frac{y2-y1}{x2-x1}$

$c$ is called $y$ intercept. It can be obtained by substituting $(x1,y1)$ or $(x2,y2)$ in the equation of the line