Strategy for Solving Equations with Fraction or Decimal Coefficients
When a linear equation contains terms with fraction or decimal coefficients, an efficient technique is to eliminate them before solving. This approach converts the original equation into an equivalent one that uses only integers, making the subsequent algebra simpler. The procedure consists of three steps:
- Find the LCD. Determine the least common denominator (LCD) of all the fractions and decimals (when thought of in their fraction form) in the equation.
- Multiply both sides of the equation by that LCD. Use the Multiplication Property of Equality to multiply each side by the LCD, and apply the Distributive Property so the LCD reaches every term. This step clears the fractions and decimals, yielding a new equation without them.
- Solve the resulting equation using the General Strategy for Solving Linear Equations. With all fractions and decimals removed, the equation reduces to one involving only integer coefficients and constants, which can be solved with standard techniques.
This method works because multiplying both sides of an equation by the same nonzero number produces an equivalent equation. The practical benefit is that integer arithmetic is often more straightforward, reducing errors.
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