**Question:**

ax+9y=5 and 4x+by=3 are the equation of two parallel line then minimum value of a+b is

12

Use AM>GM

Yes the ans can be negative too. Anyway the mod of the answer has to be 12.

Its not necessary that a and b are positive.

So the min. Value can be negative.

Correction a/4=9/__b__

Is there a better way to solve it? Please do tell me.

a/4 =b/9

Which means ab = 36

Now we get minimum if the 2 numbers are 6 and 6

Therefore 6+6=12

its 13 ...

Sorry

__Cos53__

A.M.is greater or equal to G.M.