Question

The graph below does not represent a function. The vertical line is not part of the graph, but may be used to answer the question below.

Answer 1

From the graph, let's list the points that can be removed to make the raph a function.

For a graph to represent a function, it must pass the vertical line test.

For a grah to pass the vertical line test, the vertical line must not touch two points at the same time.

From the graph, the points where the vertical line will touch tow points are indicated below:

Hence, we are to remove each point from this indicated area.

Let's remove both of the points below:

(x, y) ==> (4, 6), (15, 3).

Therefore, we are to remove at least two points to make the graph a function.

ANSWER:

(4, 6), (15, 3).