Posted by leah on Friday, July 8, 2011 at 5:48pm.
first find the midpoint (pointof intersection): ((4-2)/2, (1+5)/2) or 1,3/2 check that.
Next find the slope of the line that connects the points: (1+5)/(4-2)=3
so the question now, is what is the equation of a line with slope -1/3, and goes thru the point 1,3/2
y=mx+b
y=-1/3 x +b
to solve for b, put in the x,y point, and now you have m, and b.
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