This problem should be solved in Algebrator. You can either use the Line wizard titled "Line equation-two points" or the Line wizard titled "Slope of the line joining two points".

All line equations will be reported in the standard form for linear equations, "y=mx+b" where "m" is the slope. Free trial versions of Algebrator are available through these links:

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

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