x^2 / a^2 + y^2 / b^2 = 1

modifca a, b

a = 3 (slider from -5 to 5, step 0.1)
b = 2 (slider from -5 to 5, step 0.1)
c: x^(2) / a^(2) + y^(2) / b^(2) = 1