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In Exercises 1-10, determine whether the equation defines \(y\) as a linear function of \(x .\) If so, write it in the form \(y=m x+b\). \(2 x+3 y=6\)

Short Answer

Expert verified
The given equation \(2x + 3y = 6\) defines y as a linear function of x, and its slope-intercept form is \(y = -\frac{2}{3}x + 2\).

Step by step solution

01

Isolate y terms#

First, we need to isolate the y terms on one side of the equation. \(2x + 3y = 6\) Subtract 2x from both sides: \(3y = -2x + 6\)
02

Find the slope of the linear function (m) #

Divide both sides by 3 to isolate y: \(y = -\frac{2}{3}x + 2\) Now, the equation is in slope-intercept form \((y=mx+b)\).
03

Identify the slope (m) and y-intercept (b) #

Comparing the equation \(y = -\frac{2}{3}x + 2\) with \(y = mx + b\), we can determine the values of slope (m) and the y-intercept (b). The slope (m) is: \(m = -\frac{2}{3}\) The y-intercept (b) is: \(b = 2\)
04

Rewrite the function in y = mx + b form #

Now, using the identified values of slope (m) and y-intercept (b), rewrite the function in the specified form: \(y = -\frac{2}{3}x + 2\)
05

Conclusion #

The given equation defines y as a linear function of x, and we have written it in the desired form: \(y = -\frac{2}{3}x + 2\).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Slope-Intercept Form
Understanding the slope-intercept form is crucial in the study of algebra and forms the foundation of linear functions. The slope-intercept form is written as \(y = mx + b\), where \(m\) represents the slope of the line, and \(b\) signifies the y-intercept, which is the point where the line crosses the y-axis. This form is highly valued for its straightforwardness as it makes graphing linear equations quite simple. By identifying \(m\) and \(b\), you can readily visualize the behavior of the line without extensive calculations.

In our exercise, we manipulate the equation to fit this mold. The conversion process involves a series of algebraic steps that isolate \(y\), which directly leads to the formulation of the slope and y-intercept. Once in this form, interpreting and graphing the function becomes a seamless task. The slope reveals the steepness and direction of the line, while the y-intercept provides a starting point for plotting the graph.
Isolating Variables
Isolating a variable is a fundamental skill in algebra that allows us to solve equations efficiently. The goal is to have the variable we are solving for by itself on one side of the equation. For instance, with a linear equation, we aim to manipulate the equation so that \(y\) stands alone on one side. This process usually involves performing the same operation on both sides of the equation to maintain equality.

In the given exercise, we subtract \(2x\) from each side to move the \(x\)-term to the opposite side of \(3y\), eventually dividing by 3 to isolate \(y\). These steps showcase a strategy of balance: whatever operation done to one side is mirrored on the other to preserve the equation's truth. Through practice, such techniques become second nature, allowing for swifter and more accurate manipulation of equations to reveal their core components.
Linear Equation
A linear equation represents a straight line on a graph and is usually composed of two variables often denoted as \(x\) and \(y\). It is linear because each term is either a constant or the product of a constant and a single variable. The general form of a linear equation is \(Ax + By = C\), where \(A\), \(B\), and \(C\) are constants. The beauty of a linear equation lies in its simplicity and the linear relationships it describes, which are consistent and predictable.

In our context, the initial linear equation provided (\(2x + 3y = 6\)) does not immediately reveal its properties until it's reshaped into the slope-intercept form. Transforming the equation in this manner illuminates its linearity and enables us to extract the information needed to graph the line and understand its relationship between \(x\) and \(y\).
Identifying Slope and Y-Intercept
Identifying the slope and y-intercept of a linear equation is pivotal to comprehend the graph's inclination and where it intersects the y-axis. The slope, denoted as \(m\), quantifies the rate at which \(y\) changes with respect to \(x\). It is depicted by the ratio of the vertical change (rise) to horizontal change (run). If the slope is positive, the line ascends from left to right, while a negative slope indicates it descends.

The y-intercept (\b), on the other hand, indicates the value of \(y\) when \(x\) is zero; it's the point where the line crosses the y-axis. It gives an immediate starting point for drawing the line on a graph. In solving our exercise, the slope \(m= -\frac{2}{3}\) suggests the line falls as it moves from left to right, and the y-intercept \(b = 2\) indicates the line will cross the y-axis at the point (0, 2). These values are essential in sketching the line accurately on a graph.

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