$\"\"$

The rectangular equation is $\"\"$ .

For the first parametric equation consider $\"\"$ .

Substitute $\"\"$ in $\"\"$ .

$\"\"$ .

Consider $\"\"$ .

Substitute $\"\"$ in $\"\"$ .

$\"\"$

$\"\"$ .

Therefore, the parametric equations are $\"\"$ and $\"\"$ or $\"\"$ and $\"\"$ .

$\"\"$

The parametric equations are $\"\"$ and $\"\"$ or $\"\"$ and $\"\"$ .