Question 858426
{{{(y-1)/ (x+4)= - 1/3}}}

Multiply both sides by 3.
{{{(3(y-1))/(x+4)=-1}}}
{{{3(y-1)=-x-4}}}
{{{3y-3=-x-4}}}
{{{3y=-x-4+3}}}
{{{3y=-x-1}}}
{{{y=-(1/3)x-1/3}}}