Answer

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Hint-In order to solve such a question we will simply use a section formula which tells us the coordinates of the point which divides a given line segment into two parts such that their lengths are in the ratio m:n.

$\left[ {\dfrac{{m{x_2} + n{x_1}}}{{m + n}},\dfrac{{m{y_2} + n{y_1}}}{{m + n}}} \right]$

Where m, n is the ratios and x, y is the coordinates.

“Complete step-by-step answer:”

As we know that section formula or required coordinates of the point is given as

$\left[ {\dfrac{{m{x_2} + n{x_1}}}{{m + n}},\dfrac{{m{y_2} + n{y_1}}}{{m + n}}} \right]$

Given that the coordinates of the line segment $A(1,2)$ and $B(6,7)$

And the relation as

${\text{AP = }}\dfrac{2}{5}{\text{AB}}{\text{.}}$

Let the coordinates of point be \[P\left( {x,y} \right)\] then

Here, point P is on AB such that ${\text{AP = }}\dfrac{2}{5}{\text{AB}}{\text{.}}$

$

\Rightarrow \dfrac{{{\text{AP}}}}{{{\text{AB}}}} = \dfrac{2}{5} \\

\Rightarrow 5{\text{AP = 2AB }}\left[ {\because {\text{ AB = AP + PB}}} \right] \\

\Rightarrow {\text{5AP = 2(AP + PB)}} \\

\Rightarrow {\text{5AP = 2AP + 2PB}} \\

\Rightarrow {\text{3AP = 2PB}} \\

\Rightarrow \dfrac{{{\text{AP}}}}{{{\text{PB}}}} = \dfrac{2}{3} \\

$

This means P divides AB in the ratio 2:3

As, we know that the section formula for required coordinate of the point is given as \[ \Rightarrow \left( {\dfrac{{{m_2} + n{x_1}}}{{m + n}},\dfrac{{m{y_2} + n{y_1}}}{{m + n}}} \right)\]

The ratio in which point P divides the line is 2:3,

Thus m=2, n=3

And the line points coordinates are $A(1,2)$ and $B(6,7)$

Therefore coordinates of P will be

\[

\Rightarrow \left( {\dfrac{{{m_2} + n{x_1}}}{{m + n}},\dfrac{{m{y_2} + n{y_1}}}{{m + n}}} \right) \\

\Rightarrow \left( {\dfrac{{2 \times 6 + 3 \times 1}}{{2 + 3}},\dfrac{{2 \times 7 + 3 \times 2}}{{2 + 3}}} \right) \\

\Rightarrow \left( {\dfrac{{15}}{5},\dfrac{{20}}{5}} \right) \\

\Rightarrow (3,4) \\

\]

Hence, the coordinates of the point which divides the line segment joining $(1,2)$ and B $(6,7)$ internally in the ratio $2:3$ is \[\left( {3,4} \right)\].

Note- To solve these types of problems remember all the formulas of coordinate geometry. And try to draw a rough sketch of the diagram on the paper, this helps a lot in solving the question. This problem can also be done by graphical method but coordinate geometry method is always the easiest and less time consuming method.

$\left[ {\dfrac{{m{x_2} + n{x_1}}}{{m + n}},\dfrac{{m{y_2} + n{y_1}}}{{m + n}}} \right]$

Where m, n is the ratios and x, y is the coordinates.

“Complete step-by-step answer:”

As we know that section formula or required coordinates of the point is given as

$\left[ {\dfrac{{m{x_2} + n{x_1}}}{{m + n}},\dfrac{{m{y_2} + n{y_1}}}{{m + n}}} \right]$

Given that the coordinates of the line segment $A(1,2)$ and $B(6,7)$

And the relation as

${\text{AP = }}\dfrac{2}{5}{\text{AB}}{\text{.}}$

Let the coordinates of point be \[P\left( {x,y} \right)\] then

Here, point P is on AB such that ${\text{AP = }}\dfrac{2}{5}{\text{AB}}{\text{.}}$

$

\Rightarrow \dfrac{{{\text{AP}}}}{{{\text{AB}}}} = \dfrac{2}{5} \\

\Rightarrow 5{\text{AP = 2AB }}\left[ {\because {\text{ AB = AP + PB}}} \right] \\

\Rightarrow {\text{5AP = 2(AP + PB)}} \\

\Rightarrow {\text{5AP = 2AP + 2PB}} \\

\Rightarrow {\text{3AP = 2PB}} \\

\Rightarrow \dfrac{{{\text{AP}}}}{{{\text{PB}}}} = \dfrac{2}{3} \\

$

This means P divides AB in the ratio 2:3

As, we know that the section formula for required coordinate of the point is given as \[ \Rightarrow \left( {\dfrac{{{m_2} + n{x_1}}}{{m + n}},\dfrac{{m{y_2} + n{y_1}}}{{m + n}}} \right)\]

The ratio in which point P divides the line is 2:3,

Thus m=2, n=3

And the line points coordinates are $A(1,2)$ and $B(6,7)$

Therefore coordinates of P will be

\[

\Rightarrow \left( {\dfrac{{{m_2} + n{x_1}}}{{m + n}},\dfrac{{m{y_2} + n{y_1}}}{{m + n}}} \right) \\

\Rightarrow \left( {\dfrac{{2 \times 6 + 3 \times 1}}{{2 + 3}},\dfrac{{2 \times 7 + 3 \times 2}}{{2 + 3}}} \right) \\

\Rightarrow \left( {\dfrac{{15}}{5},\dfrac{{20}}{5}} \right) \\

\Rightarrow (3,4) \\

\]

Hence, the coordinates of the point which divides the line segment joining $(1,2)$ and B $(6,7)$ internally in the ratio $2:3$ is \[\left( {3,4} \right)\].

Note- To solve these types of problems remember all the formulas of coordinate geometry. And try to draw a rough sketch of the diagram on the paper, this helps a lot in solving the question. This problem can also be done by graphical method but coordinate geometry method is always the easiest and less time consuming method.

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