Answer:
B-(13,8)
Step-by-step explanation:
Given: 
=> The distance of AD = [tex]\sqrt{(1-3)^{2} + (2-8)^{2}  }  = 2\sqrt{10}[/tex]  
=> The distance of FI = [tex]\sqrt{(-7 - (-6))^{2} + (-4 -(-1))^{2}  }  = \sqrt{10}[/tex]   
So AD : FI = [tex]2\sqrt{10} : \sqrt{10} = 2[/tex] 
=> the scale factor is 2 
The distance of FG = [tex]\sqrt{((-1 -(-6))^{2} + (-1 - (-1))^{2} }  = 5[/tex] 
=> The distance of AB = FG*2 = 10 
Because A and B have the same cordinate of y, so the distance of AB is the distance of cordinate x in two points. 
another point that could represent point B is (13, 8)