Question 430830
x^2+y^2=49
y^2-2x=49 
subtract line 2 from line 1
-y^2+2x=-49
x^2+2x=0
x(x+2)=0
x=0 or -2

using line 2 y^2-2x=49
             y^2=49+2x    x=0 y^2=49 y=+- 7
             y^2=49+2x    x=-2 y^2=45  Y= +-6.70  ANS