中等MATH-INEQ-005
Which point satisfies x ≥ 0, y ≥ 0 and x + y ≤ 4?
A. (1, 2)✓ 答案
B. (3, 2)
C. (−1, 2)
D. (2, 3)
解說
(1, 2) has non-negative coordinates and 1 + 2 = 3 ≤ 4. (3, 2) and (2, 3) have coordinate sums 5. (−1, 2) breaks x ≥ 0.
(1, 2) has non-negative coordinates and 1 + 2 = 3 ≤ 4. (3, 2) and (2, 3) have coordinate sums 5. (−1, 2) breaks x ≥ 0.