Chapter 10 Counting Methods and Probability - 10.2 Use Combinations and the Binomial Theorem - 10.2 Exercises - Mixed Review - Page 697: 67

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The equation of the perpendicular bisector is: $$(x-a_1)^2+(y-b_1)^2=(x-a_2)^2+(y-b_2)^2$$ We have two points $A(6,9.3)\\B(0,8.2)$ Substitute the given values: $$(x-6)^2+(y-9.3)^2=(x-0)^2+(y-8.2)^2\\x^2-12x+36+y^2-18.6y+86.49=x^2+y^2-16.4y+67.24\\12x+2.2y-55.25=0$$