A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
Eduardo solved the following inequality, and his work is shown below:
−5(x + 4) + 21 ≥ −3 + 4(x − 8)
−5x − 20 + 21 ≥ −3 + 4x − 32
−5x + 1 ≥ 4x − 35
−9x ≥ −36
x ≥ 4
What mistake did Eduardo make in solving the inequality?
anonymous
 one year ago
Eduardo solved the following inequality, and his work is shown below: −5(x + 4) + 21 ≥ −3 + 4(x − 8) −5x − 20 + 21 ≥ −3 + 4x − 32 −5x + 1 ≥ 4x − 35 −9x ≥ −36 x ≥ 4 What mistake did Eduardo make in solving the inequality?

This Question is Open

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Eduardo made one simple mistake with the answer and a lot of us do it. xD Anyway did you know that when you divide a number by a negative number, the inequality sign changes direction? So, this > would become <. Or, this ≥ would become ≤. Eduardo divided 36 by 9. 9 is negative so we have to change the sign. Therefore, his answer should have been: x ≤ 4, as opposed to x ≥ 4. Does that make sense? (:
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.