Question 1087397
{{{m[ab]=(3-1)/(8-4)=1/2}}}

{{{m=-(2/1)=-2}}}


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Midpoint A and B:
{{{x=(4+8)/2=6}}}
{{{y=(1+3)/2=2}}}


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equation of the line that is the perpendicular bisector of AB, when A is (4,1) and B is (8,3),
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The point-slope form starts as  {{{highlight(y-2=-2(x-6))}}}, and you can find the other two forms from this.