Question 1008602
use  two given  points

({{{0}}},{{{-1}}})=({{{x[1]}}},{{{y[1]}}})
and
({{{3}}},{{{-2}}})=({{{x[2]}}},{{{y[2]}}})

{{{slope=(y[2]-y[1])/(x[2]-x[1])}}}

{{{slope=(-2-(-1))/(3-0)}}}


{{{slope=(-2+1)/3}}}

{{{slope=-1/3}}}