Find an expression for the slope of the line passing through the given points:

 (x1,y1)=(19,19)\displaystyle {\left({x}_{{1}},{y}_{{1}}\right)}={\left(-\frac{{1}}{{9}},-\frac{{1}}{{9}}\right)} 

 (x2,y2)=(1v9,19v)\displaystyle {\left({x}_{{2}},{y}_{{2}}\right)}={\left(\frac{{{1}{v}}}{{-{{9}}}},\frac{{1}}{{-{9}{v}}}\right)} 

 m=\displaystyle {m}=