Linear Inequalities in One or Two Variables Flashcards
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Read the first 7 Linear Inequalities in One or Two Variables flashcards as text
If 6 − 2x > 0, which of the following could be x?
Answer: x = 2
−2x > −6 → x < 3; only x = 2 satisfies x < 3.
A delivery service charges $5 plus $0.75 per mile. A customer's budget is $20. What is the maximum number of whole miles the delivery can cover?
Answer: 20 miles
5 + 0.75m ≤ 20 → 0.75m ≤ 15 → m ≤ 20.
Which ordered pair satisfies both y ≥ 2x − 1 and y < x + 3?
Answer: (2, 4)
Test (2, 4): 4 ≥ 3 ✓ and 4 < 5 ✓.
Solve for y: −y/4 + 1 > −2
Answer: y < 12
−y/4 > −3 → −y > −12 → y < 12.
Which point satisfies y ≤ (1/2)x + 3?
Answer: (2, 1)
Test (2, 1): 1 ≤ 1+3 = 4. True.
The number of girls g in a class is at least twice the number of boys b. Which inequality represents this?
Answer: g ≥ 2b
'Girls is at least twice boys' means g ≥ 2b.
Solve for x: 2(x − 3) > 3(x + 2)
Answer: x < −12
Expand: 2x − 6 > 3x + 6; subtract 2x: −6 > x + 6; subtract 6: x < −12.
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