Express the following linear equation in the form $ax + by + c = 0$ and indicate the values of $a$,$b$,and $c$: $x = 3y$.

Check whether $(4, 0)$ is a solution of the equation $x - 2y = 4$.

The taxi fare in a city is as follows:
For the first kilometre,the fare is Rs. $8$ and for the subsequent distance it is Rs. $5$ per $km$. Taking the distance covered as $x \, km$ and total fare as Rs. $y$,write a linear equation for this information,and draw its graph.

Express the following linear equation in the form $ax + by + c = 0$ and indicate the values of $a$,$b$,and $c$: $x - \frac{y}{5} - 10 = 0$.

Find the value of $k$,if $x = 2$,$y = 1$ is a solution of the equation $2x + 3y = k$.

Draw the graph of the linear equation in two variables: $x - y = 2$.