Vertical Lines

The program should avoid a $$divide by zero error$$ by checking for vertical lines. In a

vertical line: x$2=$ x$1$; consequently: x$2$ x$1=0.$

Note: If one of the lines is found to be vertical$/$horizontal$,$ all the program needs to do is

check to see if the other line is horizontal$/$vertical to determine whether they are

perpendicular or not.

Output

The program output should be either:

$$Lines are perpendicular$$

Or

$$Lines are not perpendicular$$Instructions

Write a Java program to determine whether two straight lines are perpendicular. The

program must prompt the user for the values of $x-y$ coordinates for two points of each

line. Coordinate figures must be read as integers.

Example: in the graph below, the line $AB$ is defined by the pairs: $(15,10)$ and $(49,25)$;

whereas the line CD is defined by $(29,5)$ and $(32,32).$

Premises

For a line represented by two points: $(x1,y1)$ and $(x2,y2),$ the slope of such line,

m $,$ is determined by:

$m=\frac{y2-y1}{x2-x1}$

Given two lines with slopes m $1$ and m $2$ respectively, the lines are perpendicular if

the product of their slopes yields $-1$ :

$(m1)(m2)=-1$