Question

A line perpendicular to the line segment joining the points
A(1,0) and B 2,3),divides it at C in the ratio of 1:3. Then the equation of the line is


2x+6y−9=0
2x+6y−7=0
2x−6y−9=0
2x−6y+7=0

Answer 1

Answer:

According to the section formula, the coordinates of the points that divides  the line segment joining the points (1,0) and (2,3) in the ratio 1:n is given by {1+nn(1)+1(2),1+nn(0)+1(3)}={n+1n+2,n+13}

The slope of the line joining the points (1,0) and (2,3) is m=2−13−0=3.

We know that two non-vertical lines are perpendicular to each other if and only if their slpoes are negative reciprocals of each other. 

Therefore, slope of the line that is perpendicular to the line joining the points (1,0) and (2,3) is =−m1=−31

Now the equation of the line passing through ={n+1n+2,n+13} and whose slope is −31 is given by,  {y−n+13}=3−1{x−n+1n+2}

⇒3[(n+1)y−3]=−[x(n+1)−(n+2)]

⇒3