Which of the following equations has a different value of x than the others?

X + 0.875 = 1.5

X - 0.025 = 0.6

X + 9.8 = 7/4

X - 7/8 = - 3/2

1 answer

To find which equation has a different value of \( x \), we will solve each equation for \( x \).

  1. Equation 1: \( X + 0.875 = 1.5 \) \[ X = 1.5 - 0.875 = 0.625 \]

  2. Equation 2: \( X - 0.025 = 0.6 \) \[ X = 0.6 + 0.025 = 0.625 \]

  3. Equation 3: \( X + 9.8 = \frac{7}{4} \) \[ X = \frac{7}{4} - 9.8 \] First, convert 9.8 to a fraction: \[ 9.8 = \frac{98}{10} = \frac{49}{5} \] Now convert \(\frac{7}{4}\) to a common denominator: \[ \frac{7}{4} = \frac{35}{20} \quad \text{and} \quad \frac{49}{5} = \frac{196}{20} \] Now, substitute back: \[ X = \frac{35}{20} - \frac{196}{20} = \frac{35 - 196}{20} = \frac{-161}{20} = -8.05 \]

  4. Equation 4: \( X - \frac{7}{8} = - \frac{3}{2} \) \[ X = -\frac{3}{2} + \frac{7}{8} \] Convert \(-\frac{3}{2}\) to a fraction with a common denominator of 8: \[ -\frac{3}{2} = -\frac{12}{8} \] Now calculate \(X\): \[ X = -\frac{12}{8} + \frac{7}{8} = \frac{-12 + 7}{8} = \frac{-5}{8} \]

Now we have the values of \( x \) for each equation:

  • From Equation 1: \( x = 0.625 \)
  • From Equation 2: \( x = 0.625 \)
  • From Equation 3: \( x = -8.05 \)
  • From Equation 4: \( x = -\frac{5}{8} \)

Comparing these, we see that:

  • Equation 1 and Equation 2 both give \( x = 0.625 \).
  • Equation 3 gives \( x = -8.05 \).
  • Equation 4 gives \( x = -\frac{5}{8} = -0.625 \).

Thus, the equation that has a different value of \( x \) than the others is:

Equation 3: \( X + 9.8 = \frac{7}{4} \) (which leads to \( x = -8.05 \)).