$\"\"$

The parametric equations of an line equation are $\"\"$ and $\"\"$ .

Eliminate the parameter $\"\"$ .

Consider $\"\"$ .

$\"\"$

Consider $\"\"$ .

$\"\"$

Substitute $\"\"$ .

$\"\"$

$\"\"$ .

The standard form of line equation is $\"\"$ .

$\"\"$

The standard form of line equation is $\"\"$ .