1. Which ordered pairs are solutions to the inequality −2x + y ≥ −4 ?
Select each correct answer.
A.(3, −1)
B. (1, −2)
C. (−1, 1)
D. (0, 1)
E. (0, −5)
MATH HELP PLZ?!? One Question!?
2018-01-17 8:31 am
回答 (6)
2018-01-17 8:43 am
✔ 最佳答案
A. When (x, y) = (3, -1): -2x + y = -2(3) + (-1) = -7 < -4 (False)B. When (x, y) = (1, -2): -2x + y = -2(1) + (-2) = -4 (True)
C. When (x, y) = (-1, 1): -2x + y = -2(-1) + (1) = 3 > -4 (True)
D. When (x, y) = (0, 1): -2x + y = -2(0) + (1) = 1 > -4 (True)
E. When (x, y) = (0, -5): -2x + y = -2(0) + (-5) = -5 < -4 (False)
The answers: B. (1, −2), C. (−1, 1) and D. (0, 1)
2018-01-18 1:11 pm
12
2018-01-17 10:05 am
The ordered pairs which are solutions to the inequality
−2x + y ≥ −4
Answer choices:
B. (1, −2)
C. (−1, 1)
D. (0, 1)
−2x + y ≥ −4
Answer choices:
B. (1, −2)
C. (−1, 1)
D. (0, 1)
2018-01-17 9:07 am
A) -2(3) + (-1) = -6 + (-1) = -7. No.
B) -2(1) + (-2) = -2 + (-2) = -4. Yes.
C) -2(-1) + 1 = 2 + 1 = 3. Yes.
D) -2(0) + 1 = 0 + 1 = 1. Yes.
E) -2(0) + (-5) = 0 + (-5) = -5. No.
B) -2(1) + (-2) = -2 + (-2) = -4. Yes.
C) -2(-1) + 1 = 2 + 1 = 3. Yes.
D) -2(0) + 1 = 0 + 1 = 1. Yes.
E) -2(0) + (-5) = 0 + (-5) = -5. No.
2018-01-17 8:54 am
mathway.com
2018-01-17 8:35 am
im too lazy to do it, but what you should do is substitute in each ordered pair into the equation and see which one comes out true. (this is a good test taking tip when given multiple choice)
for example: test answer choice A:
-2(3)+(-1)> -4
-6-1>-4
-7 is not greater than -4, so you know that A is not the right answer
for example: test answer choice A:
-2(3)+(-1)> -4
-6-1>-4
-7 is not greater than -4, so you know that A is not the right answer
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