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in Straight Lines by (42.8k points)
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If the point (5, 2) bisects the intercept of a line between the axes, then its equation is 

A. 5x + 2y = 20 

B. 2x + 5y = 20 

C. 5x – 2y = 20 

D. 2x – 5y = 20

1 Answer

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Best answer

Let the equation of the line be \(\frac{x}{a}+\frac{y}{b} = 1\) 

The coordinates of the intersection of this line with the coordinate axes are (a, 0) and (0, b). 

The midpoint of (a, 0) and (0, b) is, \(\Big(\frac{a}{2},\frac{b}{2}\Big)\) 

According to the question:

\(\Big(\frac{a}{2},\frac{b}{2}\Big)\) = (5,2)

  ⇒ \(\frac{a}{2}=5,\frac{b}{2}=2\) 

  ⇒ a = 10, b = 4 

The equation of the required line is given below:

\(\frac{x}{10}+\frac{y}{4}=1\) 

⇒ 2x + 5y = 20

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