They both can be negative or positive answer
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An equation has a defined answer. An inequality can have a range of answers. 2x=46 x must be 23. m<1 m can be from 0.999 repeating to -∞.
They both: - have variables, - are open sentences, - consist of two expressions joined by a "verb" (equals or inequality sign), - have solution sets (which may be empty or have one or more elements).
0.4Y+5=1
You solve an inequality in exactly the same was as you solve an equation, by doing the same thing to both sides. The only difference is if you multiply/divide by a negative number, when you have to turn the inequality around.
The boundary of an inequality is formed by the corresponding equation.