Q.

The equation of the line passing the point of intersection of the lines 3x+2y+4=0, 2x+5y-1=0 and whose distance from the point (2, -1) is 2 is

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a

y+1=0, 4x-3y-5=0

b

y+1=0, 4x-3y+5=0

c

y-1=0, 4x+3y-5=0

d

y-1=0, 4x+3y+5=0      

answer is B.

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Detailed Solution

GivenEquation3x+2y+4=0(1)2x+5y1=0(2)Solving(1)&(2)        x             y        124325125x220=y8+3=1154x22=y11=111  (x,  y)=(2,  1)Equationoflinepassingthrough(2,  1)  isy1=m(x+2)(3)mxy+2m+1=0

Givendistancefrom(2,  1)  to(3)=2|2m+1+2m+1|m2+1=2|4m+2|m2+1=2|2m+1|=m2+14m2+1+4m=m2+13m2+4m=0m(3m+4)=0m=0,  m=43

If  m=0  from(3)  y1=0(x+2)y1=0If  m=43  from(3)y1=43(x+2)3y3=4x84x+3y+5=0

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The equation of the line passing the point of intersection of the lines 3x+2y+4=0, 2x+5y-1=0 and whose distance from the point (2, -1) is 2 is