#### Answer

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#### Work Step by Step

(a)
The $y$ -coordinate is 3 when the $x$ -coordinate is 2.
(b)
The $x$ -coordinates are $-3\text{ and }3$ when the $y$ -coordinate is 4.
(c)
Consider the provided graph,
To describe the $x$ -coordinates of all the points on the graph, analyses the points on the graph.
The $x$ -coordinates of all the points on the graph are either positive, negative or zero value which is the all real numbers.
A real number is a number that can be found on the number line. These are the numbers that we normally use and apply in real-world applications.
Hence, the $x$ -coordinates are all real numbers.
(d)
Consider the provided graph.
To describe the $y$ -coordinates of all the points on the graph, analyze the points on the graph.
The $y$ -coordinates of all the points on the graph are all positive numbers starting with 1; zero is not one of the points of the $y$ -coordinates because the graph starts with 1.
So, the $y$ -coordinates are all real numbers greater than or equal to 1.
A real number is a number that can be found on the number line. These are the numbers that we normally use and apply in real-world applications.
Hence, the $y$ -coordinates are all real numbers greater than or equal to 1.