You are watching: When do you flip the greater than sign

## Operating v Inequalities: multiplying & Dividing

Performing multiplication or department with one inequality is nearly identical to multiply or dividing parts of classic equations (with one exception, spanned below).

Consider the complying with examples:

### The Exception: an adverse Numbers

There is one an extremely important exemption to the ascendancy that multiply or dividing an inequality is the very same as multiplying or dividing an equation.

Whenever you main point or division an inequality by a an unfavorable number, you should flip the inequality sign.

In the adhering to example, notice how the sign once the inequality is split by -2

In the complying with example, an alert how the authorize becomes a > sign once the inequality is separated by -2

-2x + 15 3-2x + 15 - 15 3 - 15-2x -12x > 6

Warning: Caution once Multiplying or splitting Variables

One very important implicitly of this dominion is: girlfriend cannot division by an unknown (i.e., a variable) uneven you room sure that its sign due to the fact that you execute not understand whether you should flip the sign of the inequality. There room plenty the instances wherein you will recognize the sign of a variable and also as a result, you deserve to multiply or divide and also know for sure whether you have to flip the inequality sign. However, friend must always ask you yourself whether you know for certain the authorize of the variable before dividing or multiplying when managing an inequality.

If 2x5y 10y, what is the variety of potential worths for x?You cannot division by y or 5y because you carry out not recognize whether y is negative or confident and, together such, you perform not know whether to flip the inequality.

## Multiple Inequalities

Just as it is feasible to deal with two simultaneously equations, so that is feasible to resolve two inequalities (or three, or four, etc.). In solving multiple simultaneously inequalities making use of multiplication or division, the many important component is to solve each inequality separately and also then integrate them.

If 2x 150, what is the variety of feasible values for x?1.) resolve each inequality alone.2x x -5x x > 2

For many students, the above set of inequalities can ideal be construed graphically. The solution to the set of inequalities is the overlapping graphical area.

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