Question 322370
Find the y coordinate of the midpoint.
{{{ym=(y1+y2)/2}}}
{{{ym=(1+9)/2=5}}}
Use the slope intercept form with slope=0.
{{{y=mx+b=ym}}}
{{{b=ym=5}}}
{{{highlight(y=5)}}}
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{{{drawing(300,300,-10,10,-10,10,circle(-2.5,5,.3),circle(-3,1,.4),circle(-2,9,.4),blue(line(-3,1,-2,9)),grid(1),graph(300,300,-10,10,-10,10,-9,5))}}}