We are given that
a line is perpendicular bisector on line between point (4,1) and (2,-5)
So, line intersect at mid-point between (4,1) and (2,-5)
so, firstly we will find mid-point
[tex](a,b)=(\frac{4+2}{2},\frac{1-5}{2})[/tex]
[tex](a,b)=(3,-2)[/tex]
now, we will find slope between (4,1) and (2,-5)
x1=4 , y1=1
x2=2 , y2=-5
slope is
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]
now, we can plug values
[tex]m=\frac{-5-1}{2-4}[/tex]
[tex]m=3[/tex]
now, our required line is perpendicular to this line
so, slope of required line is -1/m
so, we get slope
[tex]m'=\frac{-1}{3}[/tex]
we have a point as (3 ,-2)
we can use point slope form of line
[tex]y-y_1=m'(x-x_1)[/tex]
we can plug values
[tex]y+2=-\frac{1}{3}(x-3)[/tex]
now, we can solve for y
[tex]y=-\frac{1}{3}x-1[/tex]................Answer