Question
Check if the relation given by the equation represents $y$ as function of $x$.

$3 x-6=21$

Answer

$3 x-6=21$
$\therefore \mathrm{x}=9$
$\therefore \mathrm{x}=9$ represents a point on the $\mathrm{X}$-axis.
There is no $y$ involved in the equation.
So the given equation does not represent a function.

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