Straight Line Question 295

Question: A line passes through the point (3, 4) and cuts off intercepts from the coordinates axes such that their sum is 14. The equation of the line is

Options:

A) $ 4x-3y=24 $

B) $ 4x+3y=24 $

C) $ 3x-4y=24 $

D) $ 3x+4y=24 $

Show Answer

Answer:

Correct Answer: B

Solution:

  • Given $ a+b=14\Rightarrow a=14-b $ Hence the equation of straight line is $ \frac{x}{14-b}+\frac{y}{b}=1 $ . Also, it passes through $ (3,4) $

$ \therefore $ $ \frac{3}{14-b}+\frac{4}{b}=1\Rightarrow b=8 $ or 7 Therefore equations are $ 4x+3y=24 $ and $ x+y=7 $ . Trick: This question can be checked with the options as the line $ 4x+3y=24 $ passes through (3, 4) and also cuts the intercepts from the axes whose sum is 14.