Question 846284
{{{m=(y[2]-y[1])/(x[2]-x[1])}}}
{{{-9/2=(r-(-4))/(-5-(-3))}}}
{{{-9/2=(r+4)/(-5+3)}}}
{{{-9/2=(r+4)/(-2)}}}
{{{r+4=9}}}
{{{r=5}}}