I'll do one, you can do the other two.



Midpoint_AC is at  (  ,  ) or  (3,4)



Now the slope from this midpoint to vertex B is:   = -3



We can use  point-slope form    where ( ,  )   is any point on that line.



Using vertex B, and slope = -3:



   <--- point-slope form



If slope-intercept form is needed, move the 5 over:

    <--- slope-intercept form





The two others can be done similarly.   

 

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