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

 (x1,y1)=(13,169)\displaystyle {\left({x}_{{1}},{y}_{{1}}\right)}={\left({13},{169}\right)} 

 (x2,y2)=(c,c2)\displaystyle {\left({x}_{{2}},{y}_{{2}}\right)}={\left({c},{c}^{{2}}\right)} 

m=\displaystyle {m}=