Can you please me with the following problems:

Solve by the method of your choice.

x^2+y^2=50

(x-7)^2+y^2=1

I tried to find a variable that I could isolate and I wasnt sure what to mulitply by in order to get a variable to isolate.

x^2+y^2=29

-8x+y^2=41

this is as far as I got:

8(x^2+y^2=29)

now I got:

8x^2+y^2=232

-8x+y^2=41

but I still cant isolate anything.