$x^2 + xy + y^2 = 7$
$x$-axis = $\frac{\sqrt{21}}{3}$, $\frac{-2\sqrt{21}}{3}$
I don't understand how to find the $y$-axis.
$x^2 + xy + y^2 = 7$
$x$-axis = $\frac{\sqrt{21}}{3}$, $\frac{-2\sqrt{21}}{3}$
I don't understand how to find the $y$-axis.