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

Given the point $(1, 2)$,find the equation of a line on which it lies. How many such equations are there?

Yamini and Fatima,two students of Class $IX$ of a school,together contributed Rs. $100$ towards the Prime Minister's Relief Fund to help the earthquake victims. Write a linear equation which satisfies this data. (You may take their contributions as Rs. $x$ and Rs. $y$.) Draw the graph of the same.

Solve the equation $2x + 1 = x - 3$,and represent the solution$(s)$ on
$(i)$ the number line,
$(ii)$ the Cartesian plane.

Write four solutions for the equation: $\pi x + y = 9$

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