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.

anonymous · Answer

@Jagking @PinkSapphire

anonymous · Answer

can you help me with a few of the problems that I cant figure out.

anonymous · Answer

It is this 40 question worksheet that is due tomorrow and there are like 7 that I keep trying over and over again but I cannot figure them out.

anonymous · Answer

The other 36 were easy...just these 7 keep tripping me up! @PinkSapphire @Jagking

pinksapphire · Answer

When you divide an inequality by a negative, make sure to turn the sign (>) around.

anonymous · Answer

Oh, okay. When you get online do you mind helping me with some more? @PinkSapphire