[tex]\huge\fbox{Answer ☘}[/tex]
we know that
[tex]\bold{slope \: of \: a \: line = \frac{∆y}{∆x}} \\ \\\bold{= > \frac{ y_{2} - y_{1} }{ x_{2} - x_{1} } } \\ \\ \bold{= > \frac{ - 5 - 1}{ - 1 - 2} = \frac{ - 6}{ - 3} } \\ \\\bold{ = > \frac{2}{1} = 2}[/tex]
therefore ,
option 3) is correct.
hope helpful~
