Question

What is the equation of the following graph?

Answer 1

@LynFran im thinking its x2-y2=4 or x2+y2=4?

Answer 2

its a circle... so \[x ^{2}+y ^{2}=r ^{2}\]

Answer 3

we can see r=2
so r^2=?

Answer 4

x2+y2=2

Answer 5

no what 2 square=?

Answer 6

\[2^{2}=?\]

Answer 7

4

Answer 8

good so \[x ^{2}+y ^{2}=4\]

Answer 9

thank you