# Question: Is A Graph Of A Vertical Line A Function?

## Is a straight line a function?

A linear function is a function whose graph is a straight line.

The line can’t be vertical, since then we wouldn’t have a function, but any other sort of straight line is fine..

## What is a function on a graph?

Defining the Graph of a Function. The graph of a function f is the set of all points in the plane of the form (x, f(x)). We could also define the graph of f to be the graph of the equation y = f(x). So, the graph of a function if a special case of the graph of an equation. Example 1.

## What is the equation of a straight vertical line?

The equation of a vertical line always takes the form x = k, where k is any number and k is also the x-intercept . (link) For instance in the graph below, the vertical line has the equation x = 2 As you can see in the picture below, the line goes straight up and down at x = 2.

## How do you determine if a graph is a function using vertical line test?

The vertical line test can be used to determine whether a graph represents a function. If we can draw any vertical line that intersects a graph more than once, then the graph does not define a function because a function has only one output value for each input value.

## How do you know if a line on a graph is a function?

Inspect the graph to see if any vertical line drawn would intersect the curve more than once. If there is any such line, the graph does not represent a function. If no vertical line can intersect the curve more than once, the graph does represent a function.

## How do you make a vertical line on a graph?

To graph a vertical line that goes through a given point, first plot that point. Then draw a straight line up and down that goes through the point, and you’re done!

## How do you know if it’s a function on a graph?

Mentor: Look at one of the graphs you have a question about. Then take a vertical line and place it on the graph. If the graph is a function, then no matter where on the graph you place the vertical line, the graph should only cross the vertical line once.

## Is every line a function?

No, every straight line is not a graph of a function. Nearly all linear equations are functions because they pass the vertical line test. The exceptions are relations that fail the vertical line test.

## Is Y =- 2 horizontal or vertical?

Since it’s always hard to remember when these guys are horizontal and when they are vertical, I’ve got a sentence that will always save you… When you see y = -2, say this: y is always -2 and x can be anything! This tells you what the graph should look like!

## What do you call a vertical line on a graph?

Ordinate – The vertical line, or y-axis, of a graph.

## Which graph would fail the vertical line test?

Cutting or Hitting the Graph at Exactly One Point If a vertical line intersects the graph in some places at more than one point, then the relation is NOT a function. Here are some examples of relations that are NOT functions because they fail the vertical line test.

## How do you tell if something is a function without graphing?

If a vertical line crosses the relation on the graph only once in all locations, the relation is a function. However, if a vertical line crosses the relation more than once, the relation is not a function. Using the vertical line test, all lines except for vertical lines are functions.