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Question:y gt |x - 3|For which of the following tables are all the values of x and their corresponding values...

GMAT Algebra : (Alg) Questions

Source: Prism
Algebra
Linear inequalities in 1 or 2 variables
MEDIUM
...
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Notes
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Question:

\(\mathrm{y \gt |x - 3|}\)


For which of the following tables are all the values of x and their corresponding values of y solutions to the given inequality?


  1. xy
    13
    31
    53

  2. xy
    12
    31
    53

  3. xy
    13
    30
    54

  4. xy
    14
    32
    51
A
xy
13
31
53
B
xy
12
31
53
C
xy
13
30
54
D
xy
14
32
51
Solution

1. TRANSLATE the inequality into a checking process

  • Given inequality: \(\mathrm{y \gt |x - 3|}\)
  • Task: Find the table where ALL coordinate pairs (x, y) satisfy this inequality
  • This means: For every row, the y-value must be strictly greater than \(\mathrm{|x - 3|}\)

2. SIMPLIFY by checking each table systematically

I'll evaluate \(\mathrm{|x - 3|}\) for each x-value and compare with the corresponding y-value.

Checking Table A:

  • When x = 1: \(\mathrm{|1 - 3| = |-2| = 2}\), and y = 3. Since \(\mathrm{3 \gt 2}\)
  • When x = 3: \(\mathrm{|3 - 3| = |0| = 0}\), and y = 1. Since \(\mathrm{1 \gt 0}\)
  • When x = 5: \(\mathrm{|5 - 3| = |2| = 2}\), and y = 3. Since \(\mathrm{3 \gt 2}\)

All three pairs work!

Checking Table B:

  • When x = 1: \(\mathrm{|1 - 3| = 2}\), and y = 2. Since \(\mathrm{2 \gt 2}\)? No! \(\mathrm{2 = 2}\)

Table B fails immediately.

Checking Table C:

  • When x = 1: \(\mathrm{|1 - 3| = 2}\), and y = 3. Since \(\mathrm{3 \gt 2}\)
  • When x = 3: \(\mathrm{|3 - 3| = 0}\), and y = 0. Since \(\mathrm{0 \gt 0}\)? No! \(\mathrm{0 = 0}\)

Table C fails at the second pair.

Checking Table D:

  • When x = 1: \(\mathrm{|1 - 3| = 2}\), and y = 4. Since \(\mathrm{4 \gt 2}\)
  • When x = 3: \(\mathrm{|3 - 3| = 0}\), and y = 2. Since \(\mathrm{2 \gt 0}\)
  • When x = 5: \(\mathrm{|5 - 3| = 2}\), and y = 1. Since \(\mathrm{1 \gt 2}\)? No! \(\mathrm{1 \lt 2}\)

Table D fails at the third pair.


3. APPLY CONSTRAINTS to select the final answer

Only Table A satisfies the strict inequality for all coordinate pairs.

Answer: A




Why Students Usually Falter on This Problem

Most Common Error Path:

Weak APPLY CONSTRAINTS skill: Students confuse > with ≥, thinking that \(\mathrm{y = |x - 3|}\) satisfies the inequality.

For example, in Table B when x = 1, they see \(\mathrm{|1 - 3| = 2}\) and y = 2, and incorrectly think "2 equals 2, so that works." They miss that the inequality requires y to be strictly greater than \(\mathrm{|x - 3|}\), not equal to it.

This may lead them to select Choice B or get confused when multiple tables seem to "work."

Second Most Common Error:

Poor SIMPLIFY execution: Students make arithmetic errors when computing absolute values, especially with negative results inside the absolute value bars.

For instance, they might calculate \(\mathrm{|1 - 3| = -2}\) instead of \(\mathrm{|-2| = 2}\), leading to incorrect comparisons throughout their checking process.

This leads to confusion and guessing among the answer choices.

The Bottom Line:

This problem tests whether students understand that inequalities require precise boundary conditions - "greater than" means the boundary itself doesn't count. The absolute value computation is straightforward, but the strict inequality comparison is where many students stumble.

Answer Choices Explained
A
xy
13
31
53
B
xy
12
31
53
C
xy
13
30
54
D
xy
14
32
51
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