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Answer :
The given linear equation is
\(\because \) 2x + 9 = 0
\(\Rightarrow x = \frac{-9}{2} \) ...(i)
(i) The representation of the solution on the number line is shown in the figure below, where x = \( \frac{-9}{2} \) is
treated as an equation in one variable.
ii)The representation of the solution on the number line is shown in the figure below, where 2x + 9 = 0 can be written as an equation in of two variable i.e., 2x + (0).y = -9
Here, if we observe, all the values of y are permissible as (0).y is always going to be 0.
However, x always has to satisfy the equation to 2x + 9 = 0.
Hence, graph of x = \(\frac{-9}{2} \) will be a line parallel to y-axis and at a distance of \(\frac{-9}{2} \) units along negative x- axis.