Plotting a 2d graph

Can someone please help me in plotting a ellipse with a function

x^ 2 + 9y ^2 = 9

Answer 1

[Walter Roberson]

a = randi([1 5])

a = 5

b = randi([1 5])

b = 1

c = randi([3 10])

c = 3

syms x y
fimplicit( a*x^2 + b*y^2 == c ); axis equal