Chapter 1: Problem 69
Find the \(x\) and \(y\)-intercepts of the line, and draw its graph. \(\frac{1}{2} x-\frac{1}{3} y+1=0\)
Short Answer
Expert verified
The x-intercept is (-2, 0); the y-intercept is (0, 3).
Step by step solution
01
Find the x-intercept
To find the x-intercept, set the y-coordinate to zero in the equation and solve for x. Start with the equation: \(\frac{1}{2}x - \frac{1}{3}y + 1 = 0\). Substituting \(y = 0\) gives \(\frac{1}{2}x + 1 = 0\). Solving for x, you get \(x = -2\). Therefore, the x-intercept is (-2, 0).
02
Find the y-intercept
To find the y-intercept, set the x-coordinate to zero in the equation and solve for y. Use the same equation: \(\frac{1}{2}x - \frac{1}{3}y + 1 = 0\). Substituting \(x = 0\) gives \(-\frac{1}{3}y + 1 = 0\). Solving for y, you get \(y = 3\). Thus, the y-intercept is (0, 3).
03
Draw the graph
Plot the x-intercept (-2, 0) and the y-intercept (0, 3) on a coordinate plane. Draw a straight line through these two points to represent the equation \(\frac{1}{2}x - \frac{1}{3}y + 1 = 0\). This line represents all the solutions to the equation, where any point on the line is a solution (x, y) pair that satisfies the equation.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Linear Equations
A linear equation is a statement of equality between two expressions that graphically represents a straight line. In its most common form, known as the slope-intercept form, it is expressed as: \[ y = mx + b \] - where \(m\) is the slope, indicating how steep the line is- and \(b\) is the y-intercept, showing where the line crosses the y-axis.In our problem, the equation \( \frac{1}{2}x - \frac{1}{3}y + 1 = 0 \) is a linear equation. Unlike the slope-intercept form, our equation is given in what is called the standard form. Standard form of a line can be expressed as:\[ Ax + By = C \] Here, by rearranging the terms of our equation, you can identify that it fits into the standard form, illustrating a straightforward relationship between \(x\) and \(y\). Linear equations are crucial in describing proportional relationships, changing rates, and countless real-world situations.
Graphing
Graphing is a visual way of representing mathematical equations and their solutions in the form of a graph or diagram. When graphing linear equations, you often use a coordinate plane and plot points that satisfy the equation, then draw the line that crosses through these points. For instance, in the step-by-step solution given, you'll plot the intercepts you found:
- The x-intercept is \((-2, 0)\)
- The y-intercept is \((0, 3)\)
Coordinate Plane
The coordinate plane is a two-dimensional surface on which you can graph points, lines, and curves. It is composed of two number lines that intersect at a right angle at a point referred to as the origin, denoted as \((0,0)\). The horizontal number line is called the x-axis, while the vertical one is the y-axis.Every point on a coordinate plane is expressed as a pair \((x, y)\), where the first number indicates the position along the x-axis and the second number indicates the position along the y-axis. This system is essential for graphing equations like our linear equation \( \frac{1}{2}x - \frac{1}{3}y + 1 = 0 \). - To correctly graph the line, it’s crucial to first understand where the intercepts lie relative to the origin.- Recognize that each axis serves as a reference for measuring distances and directions.Using a coordinate plane helps visualize mathematical concepts more clearly, allowing us to easily interpret and understand the connections between equations and their graphs.