Ch. 2 - Graphs and Functions

Lial13th EditionCollege AlgebraISBN: 9780136881063Not the one you use?Change textbook

Lial 13th Edition

Ch. 2 - Graphs and Functions

Problem 40

Chapter 3, Problem 40

Graph each equation. 3y = x

Verified step by step guidance

Rewrite the given equation $3y = x$ in slope-intercept form $y = mx + b$ by isolating $y$. Divide both sides of the equation by 3 to get $y = \frac{x}{3}$.

Identify the slope $m$ and the y-intercept $b$ from the equation $y = \frac{1}{3}x + 0$. Here, the slope $m = \frac{1}{3}$ and the y-intercept $b = 0$.

Plot the y-intercept on the coordinate plane. Since $b = 0$, plot the point at the origin $(0,0)$.

Use the slope $\frac{1}{3}$ to find another point. From the y-intercept, move up 1 unit and right 3 units to plot the second point $(3,1)$.

Draw a straight line through the two points $(0,0)$ and $(3,1)$. This line represents the graph of the equation $3y = x$.

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Key Concepts

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

Understanding Linear Equations

A linear equation represents a straight line when graphed on the coordinate plane. It typically has the form y = mx + b, where m is the slope and b is the y-intercept. Recognizing that 3y = x can be rewritten into this form helps in graphing the line.

Slope and Intercept

The slope indicates the steepness and direction of a line, calculated as the ratio of vertical change to horizontal change. The y-intercept is the point where the line crosses the y-axis. Identifying these from the equation allows for accurate plotting of the line.

Graphing on the Coordinate Plane

Graphing involves plotting points that satisfy the equation and connecting them to form the line. Understanding how to find points by substituting values for x or y and using the slope and intercept to guide the drawing is essential for visualizing the equation.

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Graphs and Coordinates - Example

Related Practice

Textbook Question

Find the coordinates of the other endpoint of each line segment, given its midpoint and one endpoint. See Example 5(b).

midpoint $open paren 6 a comma 6 b close paren$ , endpoint $open paren 3 a comma 5 b close paren$

Textbook Question

Graph each equation. 2x +5y = 20

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Textbook Question

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