Question 748380
81x^2+4y^2-324=0
81x^2+4y^2=324
divide by 324
x^2/4+y^2/81=1
This is an equation of an ellipse with vertical major axis.
Its standard form of equation: {{{(x-h)^2/b^2+(y-k)^2/a^2=1}}}
For given equation:
center: (0,0)
a^2=81
a=9
length of vertical major axis=2a=18
b^2=4
b=2
length of minor axis=2b=4