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Question

Find the equation of the straight line passing through the point of intersection of the lines 5x6y1=0 and 3x+2y+5=0 and perpendicular to the line 3x5y+1=0.

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Solution

The equation of any line through the intersection of lines 5x6y1=0 and

3x+2y+5=0 is

5x6y1+k(3x+2y+5)=0 ...(i)

or Slope of this line is (5+3k)6+2k

Also, slope of the line 3x5y+11=0

is 35

Now, both are perpendicular

So, (5+3k)6+2k×35=1

or k=45

Therefore, equation of required line in given by

5x6y1+45(3x+2y+5)=0

or 5x+3y+8=0


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