Posted by **jess** on Sunday, September 4, 2011 at 12:27am.

We are learning inequalities and I just did some homework but the teacher returned it saying I did some of them wrong.

1. -2x - 10 < 2

2. -2x + 15 < 17

I didn't flip the inequality sign when I divided by (-2).

But why do we always have to flip the sign when we multiply or divide by a negative number?

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