Chapter 2: Problem 72
Solve inequality and graph the solution set. \(6-(5-3 x)>7 x-(3+4 x)\)
Short Answer
Expert verified
The solution is all real numbers. Graph: a solid line covering the whole number line.
Step by step solution
01
Simplify Both Sides
First, simplify each side of the inequality. Start with the left-hand side: \[ 6 - (5 - 3x) = 6 - 5 + 3x = 1 + 3x \] Now simplify the right-hand side: \[ 7x - (3 + 4x) = 7x - 3 - 4x = 3x - 3 \] So the inequality becomes: \[ 1 + 3x > 3x - 3 \]
02
Isolate the Variable
Subtract \(3x\) from both sides of the inequality to isolate the variable term on one side: \[ 1 + 3x - 3x > 3x - 3 - 3x \] This simplifies to: \[ 1 > -3 \]
03
Interpret the Result
The resulting inequality \(1 > -3\) is always true for all real numbers. Therefore, the solution to the inequality is all real numbers.
04
Graph the Solution Set
Since all real numbers are solutions, the graph on a number line is a solid line extending in both directions to infinity. Draw a line that covers the entire number line.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Graphing Inequalities
When graphing inequalities, we depict all possible solutions on a number line or coordinate plane. In our example of solving the inequality 6-(5-3 x)>7 x-(3+4 x), we found that it holds true for all real numbers. This means every number along the number line satisfies the inequality.
To graph this on the number line, we draw a solid line that extends infinitely in both directions. This infinite line symbolizes that there are no bounds to the solutions; any number you pick will satisfy the inequality.
If the inequality had a specific range, such as 0 < x < 4, we would draw a line segment between 0 and 4. Open circles would indicate that 0 and 4 are not included in the solutions (strict inequality), while closed circles would show inclusion (non-strict inequality).
Similarly, for more complex inequalities in multiple variables, you plot all points or regions that satisfy the equation. For instance, the inequality y > 2x + 1 would be graphically represented with a shaded region above the line y = 2x + 1.
Using these principles, you can effectively represent the solution set of any inequality on a graph.
To graph this on the number line, we draw a solid line that extends infinitely in both directions. This infinite line symbolizes that there are no bounds to the solutions; any number you pick will satisfy the inequality.
If the inequality had a specific range, such as 0 < x < 4, we would draw a line segment between 0 and 4. Open circles would indicate that 0 and 4 are not included in the solutions (strict inequality), while closed circles would show inclusion (non-strict inequality).
Similarly, for more complex inequalities in multiple variables, you plot all points or regions that satisfy the equation. For instance, the inequality y > 2x + 1 would be graphically represented with a shaded region above the line y = 2x + 1.
Using these principles, you can effectively represent the solution set of any inequality on a graph.
Simplifying Expressions
Simplifying expressions is a critical skill in solving inequalities. It involves reducing expressions to their simplest form to make calculations easier. In our example, the inequality 6-(5-3 x)>7 x-(3+4 x), we simplify both sides first.
Here's the step-by-step simplification process:
This process reduces complex expressions to their simplest forms, making it easier to isolate variables and solve the inequality.
Simplifying expressions involves:
Here's the step-by-step simplification process:
- For the left side: 6 - (5 - 3x). We distribute the minus sign: 6 - 5 + 3x = 1 + 3x.
- For the right side: 7x - (3 + 4x). Distribute the minus sign: 7x - 3 - 4x = 3x - 3.
This process reduces complex expressions to their simplest forms, making it easier to isolate variables and solve the inequality.
Simplifying expressions involves:
- Combining like terms: Aligning similar terms.
- Distributing multiplication over addition or subtraction.
- Applying arithmetic operations.
Isolating Variables
To solve any inequality, isolating the variable is essential. This step involves re-arranging the inequality to get the variable alone on one side. In our exercise, the simplified inequality is 1 + 3x > 3x - 3.
We then isolate the variable by performing same operations on both sides. Here, we subtract 3x from both sides:
The steps to isolate variables are:
We then isolate the variable by performing same operations on both sides. Here, we subtract 3x from both sides:
- 1 + 3x - 3x > 3x - 3 - 3x.
The steps to isolate variables are:
- Perform inverse operations, doing the same operation on both sides.
- Add or subtract terms to isolate the variable term.
- Be patient and meticulous to avoid mistakes.