



 
Hi Shahad, I'll give you some help with problem 1, a similar approach works with problem 2. In problem 1 the center $C$ of the circle must be on the line $x = 3.$ Thus $C$ has coordinates $(3, k)$ for some number $k.$ Thus the distance from $C$ to $(0, 0)$ must equal the distance from $C$ to $(3, 1).$ Solve for $k.$ Penny  


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