Problem 53 - Introductory Algebra for College Students

Question

Graph equation. \(x+1=0\)

Step-by-Step Solution

Answer

The graph of the given equation \(x + 1 = 0\) is a vertical line that intersects the x-axis at \(x = -1\).

Step 1: Solve the Equation

First, you need to solve the given equation for \(x\). The equation is \(x + 1 = 0\). To solve for \(x\), you would subtract 1 from both sides of the equation, which will leave you with the solution \(x = -1\).

Step 2: Plot the Graph

Next, you need to plot the graph of this equation. Since this is a simple linear equation, the graph would be a vertical line that passes through the point \(x = -1\) on the x-axis. You can plot the line using the solution of the equation, where the line crosses the x-axis at \(x = -1\).

Key Concepts

Solving Algebraic Equations

Algebraic equations are the cornerstone of algebra and form the basis for more advanced topics in mathematics. To solve a linear algebraic equation like \(x+1=0\), start by isolating the variable of interest, in this case, \(x\). This involves performing the same operation on both sides of the equation to maintain balance.

For the equation \(x+1=0\), you would subtract 1 from both sides. This simplifies the equation to:\[x = -1\]This managed to isolate the variable \(x\), giving us the solution. Solving algebraic equations is crucial because it provides the input necessary for plotting the graph of the equation. Remember, each step must adhere to the algebraic principles of maintaining equality, and preparations like these pave the way for graphing.

Plotting Graphs in Algebra

Plotting graphs is a visual way of representing algebraic equations. When the equation is a first-degree polynomial in \(x\), as in \(x+1=0\), the graph is a straight line. To plot the graph of such an equation, one should first solve the equation for \(x\) as shown in the previous section.

Once you have the solution, \(x = -1\), this specifies the point on the x-axis that the line will pass through. If the equation is in one variable, as it is here, the line will be vertical at the point \(x = -1\) and extend indefinitely up and down the graph. A graph provides a quick visual understanding of where the solution lies in relation to the coordinate plane, making it a valuable tool for analyzing equations and functions in algebra.

Understanding Vertical Lines

Characteristics of Vertical Lines

Vertical lines in algebraic graphing have a unique characteristic: They represent all the points where the x-coordinate is the same, and the y-coordinate can be any value. In the context of the equation \(x+1=0\), which simplifies to \(x=-1\), this reflects the definition of a vertical line.

Thus, the graph of our equation is a vertical line that intersects the x-axis at \(x=-1\). To visualize this:

• Draw a vertical line crossing the x-axis at the point \((-1,0)\).
• Recognize that every point on this line has an x-coordinate of -1, regardless of the y-coordinate.
• Finally, recall that vertical lines can't be represented by the typical slope-intercept form, \(y = mx + b\), as they have an undefined slope.

In conclusion, when an equation results in a constant variable, such as \(x = -1\), the graph will always be a vertical line that illustrates all the viable coordinate pairings for that given x-value, indicative of the solution to the equation.