# Find p for coincidental lines 12x+py =p , px + 3y -p+3=0

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Here a1=12 b1=p c1=p

a2=p b2=3 c2=p-3

Condition for coincidental lines

a1/a2=b1/b2=c1/c2

12/p=p/3=p/p-3

On comparing

12/p=p/3

p²=36

p=6,-6

a2=p b2=3 c2=p-3

Condition for coincidental lines

a1/a2=b1/b2=c1/c2

12/p=p/3=p/p-3

On comparing

12/p=p/3

p²=36

p=6,-6

Dhanumani:
It helped me very much.

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