Problem 16 - Elementary Algebra

Question

In the following problems, solve each of the conditional equations. $$ 9 m=-108 $$

Step-by-Step Solution

Answer

Answer: The value of 'm' is -12.

Step 1: Understanding the equation

We have the equation: $$ 9 m = -108 $$ Our task is to isolate the variable, m, on one side of the equation.

Step 2: Divide both sides by 9

To isolate 'm' on one side, we can divide both sides of the equation by 9: $$ \frac{9m}{9} = \frac{-108}{9} $$

Step 3: Simplify the equation

After dividing both sides of the equation by 9, we get: $$ m = -12 $$ Now, the variable 'm' is isolated, and we have found the solution to the equation: $$ m = -12 $$

Key Concepts

Elementary Algebra

Elementary algebra forms the foundation of modern mathematics; it deals with solving equations and understanding how to manipulate algebraic expressions. The primary goal is to develop the student's ability to work with variables, which are symbols used to represent unknown values. In the context of the given exercise, the equation presented is an example of a linear equation, which is one of the simplest types of algebraic expressions.

Linear equations like the one in our exercise (\( 9m = -108 \)) are the starting block for algebraic proficiency. The solution process requires understanding the balance concept—that an equation is like a scale, and what you do to one side must be done to the other to maintain the balance. This is a fundamental skill required for more complex mathematics and real-world problem-solving scenarios.

Isolate Variable

To solve for a variable means to isolate it on one side of the equation, making it the subject of the formula. Isolating the variable is essential for uncovering the unknown value the variable represents. In our example, the variable 'm' needs to be alone on one side of the equation. This is done through a process of performing inverse operations.

The inverse operation of multiplication is division, which is used in this exercise. By dividing both sides of the equation by the coefficient of the variable (in this case, 9), we effectively balance the equation and achieve the isolation of 'm'. Mastery of this concept is crucial because isolating variables is not limited to just linear equations, but extends to all forms of algebraic equations and applied problem-solving.

Equation Simplification

Equation simplification is the process of reducing an equation to its simplest form, making it easier to understand and solve. This involves eliminating complex fractions, combining like terms, and carrying out operations to leave the equation with the most direct expression of the relationship between the variables involved.

In the exercise, by dividing both sides by 9, we simplify the equation from \(9m = -108\) to \(m = -12\). This simplified form immediately shows the value of 'm' that satisfies the equation. Simplification is a skill that refines over time, as students will encounter progressively more complicated equations throughout their studies in algebra. Being able to simplify equations quickly and accurately is integral to success in algebra and beyond.