The slope of a line in the standard (x,y) coordinate plane is 4. What is the slope of a line perpendicular to that line ?

The slope of a line in the standard (x,y) coordinate plane is 4. What

1.	The slope of a line in the standard (x,y) coordinate plane is 4. What is the slope of a line perpendicular to that line ?
Answer» Solution :The MELTING point of ICE DECREASES with pressure.