# Comparing Linear Functions

#### Grade 8 Math Worksheets

**Linear functions are a type of mathematical function that can be represented by a straight line on a graph.**

Table of Contents:

- Comparing Linear Functions
- Comparing Linerar Functions with Slopes
- Comparing Linerar Functions with Equations
- Solved Examples
- FAQs

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## Comparing Linear Functions

Linear functions are a type of mathematical function that can be represented by a straight line on a graph. Comparing linear functions involves examining their slopes and intercepts to determine how they differ and how they are similar.

**Slopes:** The slope of a linear function represents the rate at which the function is increasing or decreasing. Two linear functions with the same slope have the same rate of change, and their graphs will be parallel. Two linear functions with different slopes will have different rates of change, and their graphs will be slanted differently.

**Intercepts:** The intercept of a linear function represents the point where the graph of the function crosses the y-axis. Two linear functions with the same intercept will have the same y-intercept, and their graphs will intersect at the same point on the y-axis. Two linear functions with different intercepts will intersect the y-axis at different points.

**Equation form:** The equation of a linear function can be written in slope-intercept form as y = mx + b, where m is the slope and b is the y-intercept. By comparing the values of m and b for two linear functions, you can determine how they differ and how they are similar.

**Graphical form:** You can compare the graphs of two linear functions by plotting them on the same coordinate plane. If the two graphs are parallel, they have the same slope. If they intersect at a point, they have the same y-intercept. If they intersect at multiple points, they have different slopes and y-intercepts.

In summary, to compare two linear functions, you can look at their slopes, intercepts, equation forms, and graphical forms. By examining these features, you can determine how the functions are similar and how they differ.

## Comparing Linerar Functions with Slopes

When comparing linear functions with slopes, there are several key factors to consider:

**Slope:** The slope of a linear function represents the rate of change of the function. Two linear functions with the same slope have the same rate of change, while two linear functions with different slopes have different rates of change. The slope can be positive, negative, zero, or undefined.

**Direction:** The sign of the slope determines the direction of the linear function. A positive slope indicates that the function is increasing, while a negative slope indicates that the function is decreasing. A slope of zero indicates a horizontal line, and an undefined slope indicates a vertical line.

**Magnitude:** The magnitude of the slope represents the steepness of the linear function. A larger magnitude indicates a steeper slope, while a smaller magnitude indicates a gentler slope.

**Intercept:** The y-intercept of a linear function represents the point where the graph of the function intersects the y-axis. Two linear functions with the same slope but different y-intercepts will have different graphs that are parallel. Two linear functions with different slopes will have different graphs that intersect at different points.

**Rate of Change:** The rate of change of a linear function can be compared by examining the slope. A larger slope indicates a faster rate of change, while a smaller slope indicates a slower rate of change.

**Applications:** Linear functions with different slopes can be used to model different real-world situations. For example, a function with a positive slope may represent the growth of a population, while a function with a negative slope may represent the depreciation of an asset.

In summary, when comparing linear functions with slopes, it is important to consider the direction, magnitude, intercept, rate of change, and applications of the functions. By examining these factors, you can gain a better understanding of how the functions are similar and how they differ.

## Comparing Linerar Functions with Intercepts

When comparing linear functions with intercepts, there are several key factors to consider:

**Slope:** The slope of a linear function represents the rate of change of the function. Two linear functions with the same slope have the same rate of change, while two linear functions with different slopes have different rates of change.

**Y-intercept:** The y-intercept of a linear function represents the point where the graph of the function intersects the y-axis. Two linear functions with the same slope but different y-intercepts will have different graphs that are parallel. Two linear functions with different slopes will have different graphs that intersect at different points.

**X-intercept:** The x-intercept of a linear function represents the point where the graph of the function intersects the x-axis. This is the value of x when y equals zero.

**Rate of Change:** The rate of change of a linear function can be compared by examining the slope. A larger slope indicates a faster rate of change, while a smaller slope indicates a slower rate of change.

**Applications:** Linear functions with different intercepts can be used to model different real-world situations. For example, a function with a higher y-intercept may represent a business with a higher starting revenue, while a function with a lower y-intercept may represent a business with a lower starting revenue.

In summary, when comparing linear functions with intercepts, it is important to consider the slope, y-intercept, x-intercept, rate of change, and applications of the functions. By examining these factors, you can gain a better understanding of how the functions are similar and how they differ.

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**Solved Examples **

Example 1: Compare the linear functions y = 2x + 5 and y = -3x – 1.

Solution:

Slope: The slope of the first function is 2, while the slope of the second function is -3. Therefore, the slopes are different.

Intercept: The y-intercept of the first function is 5, while the y-intercept of the second function is -1. Therefore, the y-intercepts are different.

Direction: The first function has a positive slope, while the second function has a negative slope. Therefore, the directions of the functions are different.

Magnitude: The magnitude of the first slope is greater than the magnitude of the second slope. Therefore, the first function is steeper than the second function.

Rate of Change: The first function has a faster rate of change than the second function, since its slope is greater.

Applications: The first function could represent the growth of a business or the increase in the value of an investment over time, while the second function could represent the decrease in the value of an asset over time.

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## FAQS

##### What is a linear function?

A linear function is a mathematical function that can be represented by a straight line on a graph. It has the form f(x) = mx + b, where m is the slope of the line, and b is the y-intercept.

##### What is the slope of a linear function?

The slope of a linear function is the change in y divided by the change in x, or rise over run. It represents how steep or shallow the line is.

##### What is the y-intercept of a linear function?

The y-intercept of a linear function is the point where the line crosses the y-axis. It is the value of the function when x = 0.

##### How do you compare two linear functions?

Two linear functions can be compared by comparing their slopes and y-intercepts. If the slopes are different, the function with the steeper slope will increase more rapidly. If the y-intercepts are different, the function with the higher y-intercept will have a higher value for any given value of x. You can also compare two linear functions by solving them simultaneously to find their point of intersection.

##### What are some real-life applications of linear functions?

Linear functions can be used to model a variety of real-world situations, such as calculating the cost of a phone plan based on the number of minutes used, predicting the distance traveled by a car based on its speed, or estimating the time it will take to complete a task based on the number of workers assigned to it.

##### How do you graph a linear function?

To graph a linear function, plot the y-intercept on the y-axis, and then use the slope to plot additional points on the line. Connect the points with a straight line to complete the graph.

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