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91Ó°ÊÓ

In the following exercises, find an equation of a line perpendicular to the given line and contains the given point. Write the equation in slope-intercept form. line \(x=3\), point (3,4)

Short Answer

Expert verified
y = 4

Step by step solution

01

- Identify the given line form

The given line equation is in the form of a vertical line: \(x = 3\). Vertical lines have an undefined slope.
02

- Understand the perpendicular line

A line perpendicular to a vertical line is a horizontal line. Horizontal lines have a slope of 0.
03

- Determine the equation using the given point

The given point is (3, 4). A horizontal line passing through this point will have the equation: \(y = 4\).
04

- Write the equation in slope-intercept form

For horizontal lines, the equation is already in slope-intercept form: \(y = mx + b\) where \(m = 0\) and \(b = 4\).Thus, the equation is \(y = 4\).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Equation of a Line
Lines in mathematics are typically expressed using an equation.
This equation represents all the points that lie on the line.
One common form is the slope-intercept form, but there are others.
Here are a few key points to keep in mind:
  • An equation of a line shows the relationship between the x and y coordinates of points on the line.
  • This can be written in different ways, such as slope-intercept form or standard form.
  • Understanding these forms helps you identify and work with the line’s properties.
Slope-Intercept Form
The slope-intercept form is a common way to express the equation of a line.
It is written as: \(y = mx + b\)
Here, \(m\) represents the slope, and \(b\) represents the y-intercept of the line.
Let's delve into these components:
  • Slope (m): This indicates how steep the line is. A higher value means a steeper line. It can be positive, negative, zero, or even undefined in some cases.
  • Y-Intercept (b): This is the point where the line crosses the y-axis. When x=0, y equals b.

Using slope-intercept form makes it easy to quickly understand and graph a line.
Undefined Slope
Some lines have an undefined slope, which is an important concept to grasp.
Lines with undefined slopes are vertical lines.
Here are key points to remember:
  • A vertical line has the same x-coordinate for all its points.
  • The equation of a vertical line is in the form: \(x = c\) where 'c' is a constant.
  • These lines do not cross the y-axis and their slope is considered undefined.

For example, the line \(x = 3\) has an undefined slope because it runs parallel to the y-axis passing through all the points where x is 3.
Horizontal and Vertical Lines
Horizontal and vertical lines are unique types of lines.
They are straightforward to work with once you understand their properties:
  • Horizontal Lines: These lines have a slope of 0. They remain constant along the y-axis as they extend left and right. The equation form is \(y = c\) where 'c' is a constant.

  • Vertical Lines: As mentioned, these have an undefined slope. They extend up and down, maintaining a constant x-coordinate. Their equation is \(x = c\)

It's crucial to recognize these lines since they behave differently from lines with non-zero slopes.

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