Content review: I Spy the Graph
Status: Published — approved by the creator. Mastery threshold 80% (provisional).
Clue File 1
The Intercept Mystery
Input x: → Output f(x):
From original
- Case title (Case 1 renamed “The Intercept Mystery” by creator)
- Both clues
- Hint
- Four graphs and order
- Correct answer
- Feedback (Graph D wording in Cases 2–4 corrected by creator)
⚠ Reconstructed — needs approval
- Misconception tag per wrong graph (creator-approved categories)
Step 1 · Which graph matches?
Tap a graph, then check your evidence.
- A. Graph A
- B. Graph B ✓
- C. Graph C
- D. Graph D
Answer: Graph B
✓ Correct: Yes! It crosses at (0, 6) and is positive on (−∞, 3).
✗ If A: Check the intercept first: the line must cross the y-axis at 6.
✗ If C: The y-intercept matches. Check which side of the x-intercept is positive.
✗ If D: It changes sign at 3, but its y-intercept is −6, not 6.
Clue File 2
The rising line
Input x: → Output f(x):
From original
- Case title (Case 1 renamed “The Intercept Mystery” by creator)
- Both clues
- Hint
- Four graphs and order
- Correct answer
- Feedback (Graph D wording in Cases 2–4 corrected by creator)
⚠ Reconstructed — needs approval
- Misconception tag per wrong graph (creator-approved categories)
Step 1 · Which graph matches?
Tap a graph, then check your evidence.
- A. Graph A
- B. Graph B
- C. Graph C ✓
- D. Graph D
Answer: Graph C
✓ Correct: Yes! It crosses at (0, −2) and is positive on (2, ∞).
✗ If A: The y-intercept matches. Check which side of the x-intercept is positive.
✗ If B: It changes sign at 2, but its y-intercept is 2, not −2.
✗ If D: The y-intercept matches, but this line crosses the x-axis at 4, not 2. Check the x-intercept.
Clue File 3
Below the axis
Input x: → Output f(x):
From original
- Case title (Case 1 renamed “The Intercept Mystery” by creator)
- Both clues
- Hint
- Four graphs and order
- Correct answer
- Feedback (Graph D wording in Cases 2–4 corrected by creator)
⚠ Reconstructed — needs approval
- Misconception tag per wrong graph (creator-approved categories)
Step 1 · Which graph matches?
Tap a graph, then check your evidence.
- A. Graph A
- B. Graph B
- C. Graph C ✓
- D. Graph D
Answer: Graph C
✓ Correct: Yes! It crosses at (0, 4) and is negative on (2, ∞).
✗ If A: The y-intercept matches. Check which side of the x-intercept is negative.
✗ If B: It changes sign at 2, but its y-intercept is −4, not 4.
✗ If D: The y-intercept matches, but this line crosses the x-axis at 4, not 2. Check the x-intercept.
Clue File 4
The last clue
Input x: → Output f(x):
From original
- Case title (Case 1 renamed “The Intercept Mystery” by creator)
- Both clues
- Hint
- Four graphs and order
- Correct answer
- Feedback (Graph D wording in Cases 2–4 corrected by creator)
⚠ Reconstructed — needs approval
- Misconception tag per wrong graph (creator-approved categories)
Step 1 · Which graph matches?
Tap a graph, then check your evidence.
- A. Graph A ✓
- B. Graph B
- C. Graph C
- D. Graph D
Answer: Graph A
✓ Correct: Yes! It crosses at (0, −3) and is negative on (−∞, 3).
✗ If B: It changes sign at 3, but its y-intercept is 3, not −3.
✗ If C: The y-intercept matches. Check which side of the x-intercept is negative.
✗ If D: The y-intercept matches, but this line crosses the x-axis at 6, not 3. Check the x-intercept.
Final independent mastery check
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