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Ch. 2 - Functions and Graphs
Blitzer - College Algebra 8th Edition
Blitzer8th EditionCollege AlgebraISBN: 9780136970514Not the one you use?Change textbook
All textbooksBlitzer 8th EditionCh. 2 - Functions and GraphsProblem 43
Chapter 3, Problem 43

Give the slope and y-intercept of each line whose equation is given. Then graph the linear function. f(x) = (3/4)x-2

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1
Identify the given linear function: \(f(x) = \frac{3}{4}x - 2\).
Recall that the slope-intercept form of a line is $y = mx + b$, where \(m\) is the slope and \(b\) is the y-intercept.
Compare the given function to the slope-intercept form to find the slope \(m = \frac{3}{4}\) and the y-intercept \(b = -2\).
To graph the line, start by plotting the y-intercept point at \((0, -2)\) on the coordinate plane.
From the y-intercept, use the slope \(\frac{3}{4}\) to find another point: rise 3 units up and run 4 units to the right, then draw the line through these points.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Slope of a Linear Function

The slope represents the rate of change of the function and indicates how steep the line is. It is the coefficient of x in the equation f(x) = mx + b, where m is the slope. A positive slope means the line rises, while a negative slope means it falls.
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Y-Intercept of a Linear Function

The y-intercept is the point where the line crosses the y-axis, given by the constant term b in the equation f(x) = mx + b. It represents the value of the function when x is zero and is essential for graphing the line accurately.
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Graphing Linear Functions

Graphing involves plotting the y-intercept on the coordinate plane and using the slope to find other points by rising and running from the intercept. Connecting these points forms the line representing the function, visually showing its behavior.
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Graphs of Logarithmic Functions
Related Practice
Textbook Question

Give the center and radius of the circle described by the equation and graph each equation. Use the graph to identify the relation's domain and range. (x − 3)² + (y + 1)² = 36

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Textbook Question

Find f+gf+g, f−gf-g, fgfg, and fg\(\frac{f}{g}\). Determine the domain for each function.

f(x)=6−1xf\(\left\)(x\(\right\))=6-\(\frac{1}{x}\), g(x)=1xg\(\left\)(x\(\right\))=\(\frac{1}{x}\)

Textbook Question

Use the graph of y = f(x) to graph each function g. g(x) = (1/2)f(2x)

Textbook Question

Find ƒ+g and determine the domain for each function.

f(x)= = (5x+1)/(x² - 9), g(x) = (4x -2)/(x² - 9)

Textbook Question

Find f/g and determine the domain for each function. f(x) = 2 + 1/x, g(x) = 1/x

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Textbook Question

In Exercises 41–44, use the given conditions to write an equation for each line in point-slope form and slope-intercept form. Passing through (4, -7) and parallel to the line whose equation is 3x + y - 9 = 0.