For what value of K the pair of equations 3x+4y+2=0 and 9x+12y+k represent coincident lines
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if we take x=2
y=-2
9x+12+k=0
9X2+12X-2+k=0
18+(-24)+k=0
-6+k=0
k=6
y=-2
9x+12+k=0
9X2+12X-2+k=0
18+(-24)+k=0
-6+k=0
k=6
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