$$\frac{x^2}{4}+\frac{y^2}{9}=1$$

$$\frac{x^2}{16}+\frac{y^2}{9}=1$$

$$\frac{x^2}{16}+\frac{y^2}{16}=1$$

$$x^2+\frac{y^2}{49}=1$$

$$\frac{x^2}{36}+\frac{y^2}{25}=1$$  

$$\frac{x^2}{25}+\frac{y^2}{36}=1$$  

$$\frac{x^2}{144}+\frac{y^2}{100}=1$$  

$$\frac{x^2}{100}+\frac{y^2}{144}=1$$  

(0,0)

(−3,1)

(1,−3)

(3,−1)

$$c^2=a^2-b^2$$

$$c^2=a^2+b^2$$

$$c=\sqrt{a-b}$$

$$c=\sqrt{a+b}$$

$$\sqrt[]{2}$$

$$\sqrt[]{3}$$

$$\sqrt[]{5}$$

$$\sqrt[]{6}$$

(-3 , 4) and (-3 , 0)

(3 , -4) and (3 , 0)

(-3 , -4) and (-3 , 0)

(-3 , 4) and (3 , 0)