Question 430825

x^2 + y^2 =49

y^2 -2x = 49

or, we can write  -y^2 + 2x = -49

now, add this equation to first equation,

x^2 + 2x = 0

=> x(x+2) = 0

so, x= 0 or x= -2

when x=0, then y = -7 or 7

when x= -2, then y = -sqrt(45) or sqrt(45)