Question

The equation of the straight line which passes through the point $$\left( { - 4,\,3} \right)$$  such that the portion of the line between the axes is divided internally by the point in the ratio $$5 : 3$$  is :

A. $$9x - 20y + 96 = 0$$  
B. $$9x + 20y = 24$$
C. $$20x + 9y + 53 = 0$$
D. None of these
Answer :   $$9x - 20y + 96 = 0$$
Solution :
Let the line cuts the axes at points $$A\left( {a,\,0} \right)$$   and $$B\left( {0,\,b} \right).$$   Now, given that $$\left( { - 4,\,3} \right)$$  divides $$AB$$  in the ratio $$5 : 3.$$  Then, $$ - 4 = \frac{{3a}}{8}$$   and $$3 = \frac{{5b}}{8}.$$
Therefore, $$a = \frac{{ - 32}}{3}$$   and $$b = \frac{{24}}{5}.$$   Then using the intercept form $$\frac{x}{a} + \frac{y}{b} = 1,$$   the equation of line is
$$\eqalign{ & - \frac{{3x}}{{32}} + \frac{{5y}}{{24}} = 1 \cr & {\text{or }}9x - 20y + 96 = 0 \cr} $$

Releted MCQ Question on
Geometry >> Straight Lines

Releted Question 1

The points $$\left( { - a, - b} \right),\left( {0,\,0} \right),\left( {a,\,b} \right)$$     and $$\left( {{a^2},\,ab} \right)$$  are :

A. Collinear
B. Vertices of a parallelogram
C. Vertices of a rectangle
D. None of these
Releted Question 2

The point (4, 1) undergoes the following three transformations successively.
(i) Reflection about the line $$y =x.$$
(ii) Translation through a distance 2 units along the positive direction of $$x$$-axis.
(iii) Rotation through an angle $$\frac{p}{4}$$ about the origin in the counter clockwise direction.
Then the final position of the point is given by the coordinates.

A. $$\left( {\frac{1}{{\sqrt 2 }},\,\frac{7}{{\sqrt 2 }}} \right)$$
B. $$\left( { - \sqrt 2 ,\,7\sqrt 2 } \right)$$
C. $$\left( { - \frac{1}{{\sqrt 2 }},\,\frac{7}{{\sqrt 2 }}} \right)$$
D. $$\left( {\sqrt 2 ,\,7\sqrt 2 } \right)$$
Releted Question 3

The straight lines $$x + y= 0, \,3x + y-4=0,\,x+ 3y-4=0$$         form a triangle which is-

A. isosceles
B. equilateral
C. right angled
D. none of these
Releted Question 4

If $$P = \left( {1,\,0} \right),\,Q = \left( { - 1,\,0} \right)$$     and $$R = \left( {2,\,0} \right)$$  are three given points, then locus of the point $$S$$ satisfying the relation $$S{Q^2} + S{R^2} = 2S{P^2},$$    is-

A. a straight line parallel to $$x$$-axis
B. a circle passing through the origin
C. a circle with the centre at the origin
D. a straight line parallel to $$y$$-axis

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Straight Lines


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