Chapter 2: Problem 18
Graphing Linear Functions For the given linear function, make a table of values and sketch its graph. What is the slope of the graph? $$h(t)=\frac{1}{2}-\frac{3}{4} t$$
Short Answer
Expert verified
The slope of the graph is \(-\frac{3}{4}\).
Step by step solution
01
Understand the Linear Function
The given linear function is \( h(t) = \frac{1}{2} - \frac{3}{4}t \). This function is in the form of \( y = mx + b \) where \( m \) is the slope and \( b \) is the y-intercept. For this function, the y-intercept \( b \) is \( \frac{1}{2} \), and the slope \( m \) is \(-\frac{3}{4}\).
02
Create a Table of Values
To graph the function, we'll create a table of values. Choose several values for \( t \) (for example, \(-2, -1, 0, 1, 2\)) and calculate \( h(t) \) for each. - \( t = -2 \), \( h(-2) = \frac{1}{2} - \frac{3}{4}(-2) = \frac{1}{2} + \frac{3}{2} = 2 \)- \( t = -1 \), \( h(-1) = \frac{1}{2} - \frac{3}{4}(-1) = \frac{1}{2} + \frac{3}{4} = \frac{5}{4} \)- \( t = 0 \), \( h(0) = \frac{1}{2} - \frac{3}{4}(0) = \frac{1}{2} \)- \( t = 1 \), \( h(1) = \frac{1}{2} - \frac{3}{4}(1) = \frac{1}{2} - \frac{3}{4} = -\frac{1}{4} \)- \( t = 2 \), \( h(2) = \frac{1}{2} - \frac{3}{4}(2) = \frac{1}{2} - \frac{3}{2} = -1 \)The table of values is:| \( t \) | \( h(t) \) ||-------|-------|| -2 | 2 || -1 | \( \frac{5}{4} \) || 0 | \( \frac{1}{2} \) || 1 | \( -\frac{1}{4} \) || 2 | -1 |
03
Plot the Points and Sketch the Graph
Using the table of values, plot the points \((-2, 2)\), \((-1, \frac{5}{4})\), \((0, \frac{1}{2})\), \((1, -\frac{1}{4})\), and \((2, -1)\) on a coordinate plane. Draw a straight line through these points, extending it in both directions. This line represents the graph of the linear function \( h(t) = \frac{1}{2} - \frac{3}{4}t \).
04
Identify the Slope of the Graph
The slope of a linear function in the form \( y = mx + b \) is represented by \( m \). For the function \( h(t) = \frac{1}{2} - \frac{3}{4}t \), the slope is \(-\frac{3}{4}\). This indicates that for every unit increase in \( t \), \( h(t) \) decreases by \( \frac{3}{4} \).
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Slope of a Line
The slope of a line is an important concept when dealing with linear functions. It tells us how steep the line is and in which direction it is going. In a linear equation like \( y = mx + b \), the "\( m \)" is the slope. This number indicates the rise over the run between any two points on the line.
Here, the slope \( m \) is \(-\frac{3}{4}\). This negative slope shows us a downwards trend as we move from left to right along the graph. For every 4 units you move to the right on the \( x \)-axis (or \( t \)-axis in this case), the value of \( h(t) \) will go down by 3 units. Understanding the slope helps you predict the behavior of the graph without even plotting it.
Here, the slope \( m \) is \(-\frac{3}{4}\). This negative slope shows us a downwards trend as we move from left to right along the graph. For every 4 units you move to the right on the \( x \)-axis (or \( t \)-axis in this case), the value of \( h(t) \) will go down by 3 units. Understanding the slope helps you predict the behavior of the graph without even plotting it.
Table of Values
A table of values is a handy tool for graphing linear equations. It involves choosing a set of \( x \) or \( t \) values and calculating the corresponding \( y \) or \( h(t) \) values. This helps in easily plotting points on the coordinate plane.
For the function \( h(t) = \frac{1}{2} - \frac{3}{4}t \), we choose values like -2, -1, 0, 1, and 2 for \( t \). Then, we calculate \( h(t) \) for each and get points like \((-2, 2)\) and \((0, \frac{1}{2})\). Creating this table allows us to draw the line accurately, revealing the graph's pattern in the coordinate plane.
For the function \( h(t) = \frac{1}{2} - \frac{3}{4}t \), we choose values like -2, -1, 0, 1, and 2 for \( t \). Then, we calculate \( h(t) \) for each and get points like \((-2, 2)\) and \((0, \frac{1}{2})\). Creating this table allows us to draw the line accurately, revealing the graph's pattern in the coordinate plane.
Linear Equations
Linear equations form a straight line when graphed and have a standard form of \( y = mx + b \). They are called "linear" because they graph as straight lines. Each part of the equation has a specific role: the slope \( m \) determines how steep the line is, while the \( b \) value is the y-intercept where the line crosses the y-axis.
In our example, the equation \( h(t) = \frac{1}{2} - \frac{3}{4}t \) reveals that if \( t = 0 \), then \( h(t) = \frac{1}{2} \). This y-intercept helps you start plotting the graph. With the slope and y-intercept, you're set to pinpoint how the line will look across the plane.
In our example, the equation \( h(t) = \frac{1}{2} - \frac{3}{4}t \) reveals that if \( t = 0 \), then \( h(t) = \frac{1}{2} \). This y-intercept helps you start plotting the graph. With the slope and y-intercept, you're set to pinpoint how the line will look across the plane.
Coordinate Plane
The coordinate plane is a two-dimensional surface where points are plotted. It has two axes: the horizontal \( x \)-axis and the vertical \( y \)-axis. Together, these axes help you locate any point using an ordered pair \((x, y)\).
For the given function \( h(t) = \frac{1}{2} - \frac{3}{4}t \), we use the "\( t \)" axis (equivalent to the \( x \)-axis) and "\( h(t)\)" (equivalent to the \( y \)-axis) to plot points. These points, once connected, display the linear function's graph, helping you visualize its behavior and relationship between "\( t \)" and "\( h(t)\)".
For the given function \( h(t) = \frac{1}{2} - \frac{3}{4}t \), we use the "\( t \)" axis (equivalent to the \( x \)-axis) and "\( h(t)\)" (equivalent to the \( y \)-axis) to plot points. These points, once connected, display the linear function's graph, helping you visualize its behavior and relationship between "\( t \)" and "\( h(t)\)".