Question

Difficulty: EasySolving Linear Equations

What is the value of xx that satisfies the equation 23x14=512\frac{2}{3}x - \frac{1}{4} = \frac{5}{12}?

  1. A
    14\frac{1}{4}
  2. B
    916\frac{9}{16}
  3. C
    49\frac{4}{9}
  4. 11Answer
  5. E
    1212

Answer

1
The correct answer is 1. Adding 14\frac{1}{4} to both sides of the equation 23x14=512\frac{2}{3}x - \frac{1}{4} = \frac{5}{12} gives 23x=512+312=812\frac{2}{3}x = \frac{5}{12} + \frac{3}{12} = \frac{8}{12}. Simplifying 812\frac{8}{12} yields 23\frac{2}{3}, so 23x=23\frac{2}{3}x = \frac{2}{3}. Multiplying both sides by 32\frac{3}{2} isolates xx, giving x=1x = 1.

Step-by-Step Solution

1
Add 14\frac{1}{4} to both sides of the equation to isolate the variable term.
23x=512+14\frac{2}{3}x = \frac{5}{12} + \frac{1}{4}
To solve for xx, terms containing xx must be isolated on one side of the equation.
2
Find a common denominator to add the fractions on the right side.
23x=512+312=812=23\frac{2}{3}x = \frac{5}{12} + \frac{3}{12} = \frac{8}{12} = \frac{2}{3}
Fractions must have the same denominator to be added.
3
Multiply both sides of the equation by the reciprocal of the coefficient of xx, which is 32\frac{3}{2}.
x=2332=1x = \frac{2}{3} \cdot \frac{3}{2} = 1
Multiplying a coefficient by its reciprocal yields 11, isolating the variable xx.

Key Concept

Solving single-variable linear equations involving fractions by isolating the variable using inverse operations.
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