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For each equation identify the order of operations. Then work backward through the order of operations to find \(x\). a. \(\frac{x-3}{2}=6\) b. \(3 x+7=22\) (a c. \(\frac{x}{6}-20=-19\)

Short Answer

Expert verified
a. \(x = 15\); b. \(x = 5\); c. \(x = 6\).

Step by step solution

01

Understand the Order of Operations

For solving equations, use the **order of operations**, often remembered by the acronym PEMDAS (Parentheses, Exponents, Multiplication and Division (from left to right), Addition, and Subtraction (from left to right)). Here, we're reversing these steps to isolate and find the value of the variable `x`.
02

Solve Equation (a): \(\frac{x-3}{2}=6\)

Start by eliminating the division by 2. Multiply both sides of the equation by 2 to remove the fraction:\[ x - 3 = 12 \]Next, add 3 to both sides to isolate \(x\):\[ x = 15 \]
03

Solve Equation (b): \(3x+7=22\)

First, eliminate the constant added to \(3x\). Subtract 7 from both sides:\[ 3x = 15 \]Next, divide both sides by 3 to solve for \(x\):\[ x = 5 \]
04

Solve Equation (c): \(\frac{x}{6}-20=-19\)

First, add 20 to both sides to eliminate the subtraction:\[ \frac{x}{6} = 1 \]Finally, multiply both sides by 6 to solve for \(x\):\[ x = 6 \]

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Key Concepts

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

Solving Equations
Solving equations is like solving a mystery. You have a math problem that you need to unravel to find the unknown value, usually represented by the variable \(x\). The goal is to figure out what number makes the equation true. This usually involves isolating \(x\) on one side of the equation.

Here are some basic tips to keep in mind:
  • Always perform the same operation on both sides of the equation. This keeps the equation balanced.
  • Work through the equation step by step, checking your progress as you go.
  • Use inverse operations to cancel out terms and simplify the equation.
By following these simple steps, you can solve a variety of equations ranging from simple to complex.
Algebra
Algebra is a branch of mathematics that deals with symbols and the rules for manipulating those symbols. In basic algebra, the symbols often represent numbers and are used to express equations and relationships between quantities.

Think of algebra as a language. Instead of words and sentences, you use numbers, variables, and operations to express ideas. For example, in the equation \(3x + 7 = 22\), \(x\) is a variable representing an unknown number. Your job is to figure out this unknown by manipulating the equation based on mathematical rules.

Algebra is vital because it forms the foundation for more advanced math and science. It's like a universal tool that lets you solve problems involving quantities, structure, space, and change. Once you grasp the basics, you'll find that algebra opens up a world of possibilities.
PEMDAS
PEMDAS helps you remember the order in which you should perform operations in a math problem. It stands for Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

Following the order of operations is crucial when calculating expressions to ensure consistent and correct results.
  • Handle operations inside Parentheses first since they may affect everything else.
  • Next, focus on Exponents or Powers — these need attention before straightforward arithmetic operations.
  • Proceed with Multiplication and Division, moving from left to right.
  • Finish with Addition and Subtraction, also moving from left to right.
While solving an equation often involves reversing these steps, understanding how they work will greatly enhance your efficiency in solving problems.
Inverse Operations
Inverse operations are operations that 'undo' each other. For example, addition and subtraction are inverse operations, as are multiplication and division. These are incredibly useful when solving equations because they allow you to isolate the variable on one side.

In the context of equations, if you're dealing with an equation like \(x + 5 = 9\), you would use subtraction (the inverse of addition) to solve for \(x\). Subtract 5 from both sides to get \(x = 4\). Similarly, if you have \(3x = 15\), you use division (the inverse of multiplication) to find \(x = 5\) by dividing both sides by 3.
  • Think of inverse operations as the tool belt for your math problem-solving.
  • They help you take apart and reconstruct equations easily and systematically.
  • Always apply inverse operations equally to both sides to maintain the balance of the equation.
Mastering inverse operations simplifies algebraic operations and enhances your understanding of mathematical relationships and functions.

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