Give the geometric representations of $y = 3$ as an equation:
$(i)$ in one variable
$(ii)$ in two variables

(N/A) $(i)$ $y = 3$ [An equation in one variable]
Since $y = 3$ is an equation in one variable,it represents a unique point on the number line.
The unique solution is a point at $3$ on the number line.
$(ii)$ $y = 3$ [An equation in two variables]
We can write $y = 3$ as $0x + y = 3$.
Now,for different values of $x$,we get $y = 3$:

$X$	$1$	$2$	$3$
$Y$	$3$	$3$	$3$

Plotting the ordered pairs $(1, 3)$,$(2, 3)$,and $(3, 3)$ on a Cartesian plane,we get a line $AB$ parallel to the $x$-axis,which represents the solution of $0x + y = 3$,i.e.,$y = 3$.