The graph of the equation $0x + 3y = 21$ is perpendicular to which axis?

State whether the following statement is True or False and justify your answer:
Every point on the graph of a linear equation in two variables does not represent a solution of the linear equation.

Write four solutions for the following equation: $5x + 3y = 16$.

The graph of the linear equation $2x + 3y = 6$ cuts the $y$-axis at the point:

Write the linear equation such that each point on its graph has an ordinate $3$ times its abscissa.

Write four solutions for the following equation: $4x - 3y = 24$.