y2=4axy^{2}=4 a xy2=4ax
y2b2−x2a2=1\frac{y^{2}}{b^{2}}-\frac{x^{2}}{a^{2}}=1b2y2−a2x2=1
x2a2+y2b2=1\frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}=1a2x2+b2y2=1
x2a2−y2b2=1\frac{x^{2}}{a^{2}}-\frac{y^{2}}{b^{2}}=1a2x2−b2y2=1