# SOLUTION: Hi i am really hoping you can help me here, i have never uses a tutor before but i was frantically trying to find something to help me so here it goes... if i have 3 ordered pai

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 Geometry: Angles, complementary, supplementary angles Solvers Lessons Answers archive Quiz In Depth

 Question 80049: Hi i am really hoping you can help me here, i have never uses a tutor before but i was frantically trying to find something to help me so here it goes... if i have 3 ordered pairs (3,15) (12,13) (5,7) on a graph and are making a scalene triangle. The question is how to do make this into in the an equation of two of the perpendicular Bisectors. and then getting that information i am not sure how to solve it. i am thinking if i get it started i will be able to finish it but i have NO idea even how to start to get an equation set up. THANK YOU SO MUCH!Answer by stanbon(57387)   (Show Source): You can put this solution on YOUR website!i have 3 ordered pairs (3,15) (12,13) (5,7) on a graph and are making a scalene triangle. The question is how to do make this into in the an equation of two of the perpendicular Bisectors. --------------- Choose two of the points: (3,15),(12,13) Find the slope and midpoint of the line segment joining the two points. slope: [13-15]/[12-3]= -2/9 mid-pt: x=(3+12)/2=15/2 ........y=(13+15)/2=14 Now find the equation of the line perdicular to the line segment and passing thru the mid-p. The slope of the bisector is 9/2 because it must be the negative inverse of the line segment;s slope. --------- So, slope = 9/2 and it passes thru (15/2,14) Form is y=mx+b Substitute the x,y, and m values to find "b", as follows: 14=(9/2)(15/2)+b 14=135/4 + b 56/4 = 135/4+b b=-79/4 EQUATION of one of the perpendicular bisectors: y=(9/2)x-79/4 ------------ Follow the same procedure to find the 2nd perpendicular bisector. ============ Cheers, Stan H.