Algebrator allows for graphing equations and specific points.  The equation "3y+15=0" solves for y=-5, identifying a single point (0,-5).  In contrast, if 'x' is not restricted to '0', the equation '3y+15=x' defines a line. 

To help you clearly understand our desktop software and how appropriate it may be for your needs, please use one of the following links to obtain a free trial of the program:

Windows: https://www.softmath.com/tr/alg51win-tr-en.exe

Mac: https://www.softmath.com/tr/alg51mac-tr-en.dmg