If the graph of a pair of linear equations $a_{1}x+b_{1}y+c_1=0$ and $a_{2}x+b_{2}y+c_2=0$ is represented by two lines, then fill the following blanks:

If the lines are parallel, then the pair of equations has _____ solution. In the case, the pair of equations is _____

If the area of the shaded region is $k \mathrm{sq}. \mathrm{units}$, then find the value of $k$.

The area of $△ABD$ is $k$ square unit. Find $k$.

The area of $△ABC$ is $k$ square unit. Find $k$.

Find the area of shaded region?

Find the area of shaded region?

The area of shaded region is $k$ square unit. Find $k$.