If the slope of the line 
is negative, then the slope of a line 
perpendicular to 
may be positive or negative?
Definitions:
User Account
A profile on a computer or online service that represents a user's identity and permissions.
Log-in
The process of gaining access to a computer system or application by entering a username and password.
Start Screen
The initial screen displayed by some operating systems or applications upon startup.
CTRL+ESC
A keyboard shortcut in Windows operating systems that opens the Start menu, providing access to programs, files, and settings.
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