# Quick Answer: Can A Straight Line Be A Function?

## How can I tell if a graph is a function?

If, alternatively, a vertical line intersects the graph no more than once, no matter where the vertical line is placed, then the graph is the graph of a function.

For example, a curve which is any straight line other than a vertical line will be the graph of a function..

## Can a horizontal line be a function?

Horizontal lines are, in fact, functions. … It is not a function. A function must only have one y value for each x value. A horizontal line has the same y value for every x value – it is a constant NOT a function.

## What is horizontal line test used for?

In mathematics, the horizontal line test is a test used to determine whether a function is injective (i.e., one-to-one).

## What is an example of a horizontal line?

An equation that only crosses the y-axis is a horizontal line. … For example: y=5 is a horizontal line that crosses the y-axis at (0,5).

## Is a circle a function?

A circle is a set of points in the plane. A function is a mapping from one set to another, so they’re completely different kinds of things, and a circle cannot be a function.

## Is a straight line a relation?

The formal term to describe a straight line graph is linear, whether or not it goes through the origin, and the relationship between the two variables is called a linear relationship.

## What is not a function?

A function is a relation in which each input has only one output. In the relation , y is a function of x, because for each input x (1, 2, 3, or 0), there is only one output y. x is not a function of y, because the input y = 3 has multiple outputs: x = 1 and x = 2.

## Is a horizontal line positive or negative?

The slope of a line can be positive, negative, zero, or undefined. A horizontal line has slope zero since it does not rise vertically (i.e. y1 − y2 = 0), while a vertical line has undefined slope since it does not run horizontally (i.e. x1 − x2 = 0).

## What is the equation of the horizontal line through 1 9?

Answer: y-9 = 0 ( or ) y= 9 is the correct equation. where m = slope of the line passing through . thus you got the answer.

## Is a line always 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 a straight vertical line a function?

For a relation to be a function, use the Vertical Line Test: Draw a vertical line anywhere on the graph, and if it never hits the graph more than once, it is a function. If your vertical line hits twice or more, it’s not a function.

## What is a straight line function called?

Linear functions are those whose graph is a straight line. A linear function has the following form. y = f(x) = a + bx. A linear function has one independent variable and one dependent variable.

## How do you tell if an equation is a straight line?

Equations of straight lines are in the form y = mx + c (m and c are numbers). m is the gradient of the line and c is the y-intercept (where the graph crosses the y-axis).

## How is horizontal line drawn?

The horizontal line is drawn by connecting similar swing lows in price to create a horizontal support line. For a horizontal resistance line, similar swing highs are connected. … In more simple terms, a horizontal line on any chart is where the y-axis values are equal.

## 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.

## Is a graph with a vertical line a function?

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.

## What is equation of a line?

The equation of a line is typically written as y=mx+b where m is the slope and b is the y-intercept. If you know two points that a line passes through, this page will show you how to find the equation of the line.

## How do you write an equation of a line?

The two most common forms for writing the equation of a line are y=mx+b (slope-intercept form) and y−y1=m(x−x1) (point-slope form), where m is the slope of the line, and b is the y-intercept. The slope of the line is sometimes called riserun (said: rise over run).