A line segment is bisected by a line with the equation - 3 y + 4 x = 6 . If one end of the line segment is at ( 3 , 1 ), where is the other end?

1 Answer
Jun 21, 2017

The other end is =(51/25,129/75)

Explanation:

Let the other end be (x,y)

Then the mid-point of the line is =((x+3)/2, (y+1)/2)

The slope of the line -3y+4x=6 ............(1)

is

=4/3

The slope of the line perpendicular is

=-3/4

The equation of the line is

-3/4(x-3)=(y-1)

-3x+9=4y-4

4y+3x=13 .............(2)

Solving for x and y, in equations (1) and (2)

4x-3*(13-3x)/4=6

16x-39+9x=24

25x=24+39=63

x=63/25

y=1/3*(4*63/25-6)

=102/75

The mid-point is =(63/25,102/75)

So,

(x+3)/2=63/25

x=126/25-3=51/25

(y+1)/2=102/75

y=204/75-1=129/75

The other end is =(51/25,129/75)