Answer:
Explanation:
We will apply the vertical line test in the given graphs to test them for a function.
Option (1) [First in top row]
If we draw a vertical line from any point, none other point of the graph passes through it.
Therefore, Graph (1) is a function.
Option (2) [2nd in the top row]
When we draw a vertical line through (2, 1), another point (2, -1) will pass through this line.
Therefore, Graph (2) is not a function.
Option (3) [1st in the second row]
In this option when a vertical line is drawn from (2, 1) two more points (2, 2) and (2, 3) pass through this line.
Therefore, graph (4) is not a function.
Option (4). [2nd in the 2nd row]
In this graph only one point lie on the vertical lines drawn.
Therefore, Graph (4) is a function.