# What are common mistakes students make with systems of inequalities?

##### 1 Answer

Oct 19, 2015

Number one is probably forgetting to consider reversing the inequality when multiplying both sides by a value that can be negative.

#### Explanation:

For example:

#(x+1)/(x-1) < 3#

First step - multiply through by

#x+1 color(red)(<) 3x - 3#

Oops! What if