Interceptor !

Geometry Level 2

A straight line through the point A ( 3 , 4 ) A(3,4) is such that its intercept between the axes is bisected at A A . What is the equation of the line?

3 x 4 y + 24 = 0 3x-4y+24=0 2 x + 3 y 24 = 0 2x+3y-24=0 4 x + 3 y = 24 4x+3y=24 x + y = 12 x+y=12

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4 solutions

Eric Escober
Apr 9, 2015

Since Point A bisects the segment connecting the intercepts, A ( 3 , 4 ) A(3,4) is the m i d p o i n t midpoint of the intercepts ( a , 0 ) (a,0) and ( 0 , b ) (0,b) .

Midpoint Formula:

( a + 0 2 , 0 + b 2 ) = ( 3 , 4 ) (\frac{a+0}{2}, \frac{0+b}{2}) = (3,4)

So we can get a = 6 a=6 , b = 8 b=8 .

Two-Point Formula:

y 0 = ( 8 0 0 6 ) ( x 6 ) y-0=(\frac{8-0}{0-6})(x-6)

Thus arriving at the equation of the line: 4 x + 3 y = 24 4x+3y=24

Gagan Raj
Mar 29, 2015

I know this is a very easy problem.....but please refrain from plugging the values directly into the given equations and then getting the answer right!!!!

You can change the options to make multiple choices 'seem' correct.

B.S.Bharath Sai Guhan - 6 years, 2 months ago
Ramesh Goenka
Mar 28, 2015

X intercept of the line= 3*2=6

Y intercept of the line= 4*2=8

Equation of the line= (x/6) +(y/8)=1 = 4x+3y=24

I know that this is not the best way, but here goes...

We are given that point A ( 3 , 4 ) A(3,4) lies on the required line. Substituting the point in the given equations, we get the line equation to be l : 4 x + 3 y = 24 \displaystyle l : 4x + 3y = 24

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