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?

When dividing by −9, he did not change the ≥ to ≤.

He subtracted 4x from both sides when he should have added 5x.

He subtracted 1 from both sides when he should have added 36.

He did not make a mistake.

Question

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? 

 
 	
	When dividing by −9, he did not change the ≥ to ≤.

	He subtracted 4x from both sides when he should have added 5x.

	He subtracted 1 from both sides when he should have added 36.

	He did not make a mistake.

isaiahjwolfe · Answer

I think it's A, if I remember correctly you switch the sign when dividing by a negative number.

anonymous · Answer

thank you!

isaiahjwolfe · Answer

np!

pooja195 · Answer

@isaiahjwolfe Hello and Welcome to OpenStudy! :) You seem new here and more than willing to help which is mighty fine since we need all the help we can get :) but you might want to take some time and read this site's code of conduct! http://openstudy.com/code-of-conduct This site has a policy for "Give Help, Not Answers" violations of such policies could potentially result in an account suspension or ban. It's great to see another helper among us, so it would be sad if you got in trouble for giving out answers. Hope you'll have a nice time here on OpenStudy, and I'll see ya around :) Have a Nice Day!

isaiahjwolfe · Answer

@pooja195 I'm sorry, I didn't know this wasn't aloud! I'll try my best to keep these rules. Thanks for telling me ahead of time!

pooja195 · Answer

No problem! :)