Understanding the Concept of Eliminating Fractions

Oct 13, 2025 by wbrum.org 89 views

When working with algebraic equations that contain fractions, it's often necessary to eliminate the fractions in order to simplify the equation and solve for the variable. In this article, we'll explore how to eliminate fractions in a specific equation and determine the correct value to multiply by.

The Equation

The given equation is:

$\frac{x}{4} + \frac{x}{6} = \frac{16}{3}$

Our goal is to eliminate the fractions in this equation and solve for the variable $x$ .

Understanding the Concept of Eliminating Fractions

To eliminate fractions, we need to find a common denominator for all the fractions in the equation. The common denominator is the least common multiple (LCM) of the denominators of the fractions. In this case, the denominators are 4, 6, and 3.

Finding the Least Common Multiple (LCM)

To find the LCM of 4, 6, and 3, we can list the multiples of each number:

Multiples of 4: 4, 8, 12, 16, 20, ...
Multiples of 6: 6, 12, 18, 24, 30, ...
Multiples of 3: 3, 6, 9, 12, 15, ...

The smallest number that appears in all three lists is 12, which is the LCM of 4, 6, and 3.

Multiplying the Equation by the LCM

To eliminate the fractions, we need to multiply the entire equation by the LCM, which is 12.

$\frac{x}{4} + \frac{x}{6} = \frac{16}{3}$

Multiplying both sides of the equation by 12:

$12 \times \frac{x}{4} + 12 \times \frac{x}{6} = 12 \times \frac{16}{3}$

Simplifying the equation:

$3x + 2x = 64$

Combining like terms:

$5x = 64$

Solving for $x$

To solve for $x$ , we can divide both sides of the equation by 5:

$\frac{5x}{5} = \frac{64}{5}$

$x = \frac{64}{5}$

Conclusion

In this article, we explored how to eliminate fractions in a specific algebraic equation. We found the least common multiple (LCM) of the denominators, multiplied the equation by the LCM, and simplified the equation to solve for the variable $x$ . The correct value to multiply by in order to eliminate the fractions is 12.

Answer

The correct answer is:

D. 12

Additional Tips and Tricks

When working with fractions, it's essential to find the least common multiple (LCM) of the denominators to eliminate the fractions.
Multiplying the equation by the LCM will eliminate the fractions and simplify the equation.
Be careful when multiplying and dividing fractions, as the order of operations matters.

In our previous article, we explored how to eliminate fractions in a specific algebraic equation. However, we know that there are many more questions and scenarios that can arise when working with fractions in algebra. In this article, we'll address some of the most frequently asked questions (FAQs) about eliminating fractions in algebraic equations.

Q: What is the least common multiple (LCM) and why is it important?

A: The least common multiple (LCM) is the smallest number that is a multiple of two or more numbers. In the context of algebraic equations, the LCM is essential because it allows us to eliminate fractions by multiplying the entire equation by the LCM.

Q: How do I find the LCM of two or more numbers?

A: To find the LCM of two or more numbers, you can list the multiples of each number and find the smallest number that appears in all the lists. Alternatively, you can use the following formula:

LCM(a, b) = (a × b) / GCD(a, b)

where GCD(a, b) is the greatest common divisor of a and b.

Q: What is the greatest common divisor (GCD) and how is it related to the LCM?

A: The greatest common divisor (GCD) is the largest number that divides two or more numbers without leaving a remainder. The GCD is related to the LCM because the product of the GCD and the LCM is equal to the product of the two numbers:

GCD(a, b) × LCM(a, b) = a × b

Q: Can I eliminate fractions in an equation by multiplying both sides by a number other than the LCM?

A: No, you cannot eliminate fractions in an equation by multiplying both sides by a number other than the LCM. Multiplying both sides by a number other than the LCM will not eliminate the fractions and may introduce extraneous solutions.

Q: What if I have a fraction with a variable in the denominator? How do I eliminate the fraction?

A: If you have a fraction with a variable in the denominator, you can eliminate the fraction by multiplying both sides of the equation by the variable. For example, if you have the equation:

$\frac{x}{x+2} = 3$

You can eliminate the fraction by multiplying both sides by (x+2):

$x = 3(x+2)$

Q: Can I eliminate fractions in an equation with multiple variables?

A: Yes, you can eliminate fractions in an equation with multiple variables by finding the LCM of the denominators and multiplying both sides of the equation by the LCM.

Q: What if I have a fraction with a negative exponent? How do I eliminate the fraction?

A: If you have a fraction with a negative exponent, you can eliminate the fraction by multiplying both sides of the equation by the reciprocal of the base raised to the power of the negative exponent. For example, if you have the equation:

$\frac{1}{x^{-2}} = 3$

You can eliminate the fraction by multiplying both sides by x^2:

$x^2 = 3$

Conclusion

In this article, we addressed some of the most frequently asked questions (FAQs) about eliminating fractions in algebraic equations. We covered topics such as the least common multiple (LCM), greatest common divisor (GCD), and how to eliminate fractions in equations with multiple variables and negative exponents. By following these tips and tricks, you'll be able to eliminate fractions in algebraic equations with ease and solve for the variable with confidence.