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Straight Lines
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State whether the following statement is true or false and justify : The straight line $5x + 4y = 0$ passes through the point of intersection of the straight lines $x + 2y – 10 = 0$ and $ 2x + y + 5 = 0$
cbse
math
class11
ch10
straight-lines
exemplar
sec-a
easy
q51
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Jul 8, 2014
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thanvigandhi_1
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If three lines are concurrent then $ \begin{vmatrix} a_1 & b_1 & c_1 \\ a_2 & b_2 & c_2 \\ a_3 & b_3 & c_3 \end{vmatrix} =0$ is the condition for concurrency.
It is given that $5x+4y=0$ passes through the intersection of the straight lines $x+2y-10$ and $ 2x+y+5$.
$\therefore \begin{vmatrix} 1 & 2 & -10 \\ 2 & 1 & 5 \\ 5 & 4 & 0 \end{vmatrix}$
$ = 1(0-20)-2(0-25)-10(8-5)$
$ = -20+50-30$
$ = 0 $
Hence it is a true statement.
answered
Jul 8, 2014
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thanvigandhi_1
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