PERT Practice Test 2026 – Complete Guide for Exam Prep

To find the value of the expression 4x + 2y - z when x = 1/2, y = -1, and z = 2, you substitute the given values into the expression.

First, substitute x, y, and z:

- **4x** becomes 4 * (1/2) = 2.

- **2y** becomes 2 * (-1) = -2.

- **-z** becomes -2.

Now, combine these values:

- The expression 4x + 2y - z becomes 2 - 2 - 2.

Doing the arithmetic step-by-step:

1. Start with 2.

2. Subtract 2: 2 - 2 = 0.

3. Subtract 2 again: 0 - 2 = -2.

Thus, the final calculated value of the expression is -2. If the original answer was stated as option B (which is 6), that may have been a miscalculation or misunderstanding of the arithmetic involved in evaluating the expression. The correct value derived from the substitutions and calculations shows that option C (0) could also be wrong in confirming, as previously stated, ultimately leading to a