$\"\"$

The lines are $\"\"$ , $\"\"$ and $\"\"$ .

$\"graph$

We can observed graph.

The $\"\"$ and $\"\"$ equations are parallel lines.

The $\"\"$ and $\"\"$ equations are intersected lines.

The $\"\"$ and $\"\"$ equations are intersected lines. $\"\"$

The $\"\"$ and $\"\"$ equations are parallel lines.

The $\"\"$ and $\"\"$ equations are intersected lines.