Question

help

Answer 1

typo somewhere
too many equal signs

Answer 2

it is an ellipse

Answer 3

it is also not a function

Answer 4

if you divide both sides by 81 you get
\[\frac{x^2}{27}+\frac{y^2}{3}=1\] the standard form of an ellipse

Answer 5

yw

Answer 6

if "range" is supposed to be the length along the y axis, it is \(2\sqrt3\) from \((0,-\sqrt3)\) to \((0,\sqrt3)\)