Q.

The distance between 1,1 and the point of intersection of two lines 2x+3y+c=0 and 3x+2y+c=0 is less than 22 then

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a

−15,5

b

−10,0

c

−10,10

d

−195,0

answer is A.

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Detailed Solution

To get the point of intersection of two lines, eliminate x32x+3y+c−23x+2y+c=06x+9y+3c−6x−4y−2c=05y+c=0y=−c5Substitute y=−c5 in the equation   2x+3y+c=02x+3−c5+c=010x−3c+5c=010x+2c=0x=−c5Hence, the point of intersection is   −c5,−c5Given that the distance between 1,1 and −c5,−c5  is  1+c52+1+c52<22It implies that 21+c52<22Squaring and then simplify 21+c52<81+c52<4Apply square root on both sides −2<1+c5<2−3
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