Question 908106
First find the slope.
{{{m=(y[2]-y[1])/(x[2]-x[1])=(1-3)/(-5-(-1))=(-2)/(-5+1)=(-2)/(-4)=1/2}}}
Now use the point-slope form with either point.
{{{y-y[1]=m(x-x[1])}}}
{{{y-3=(1/2)(x-(-1))}}}
{{{2(y-3)=x+1}}}
{{{2y-6=x+1}}}
{{{-x+2y=7}}}
{{{highlight(x-2y=-7)}}}