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Mathematics 14 Online
OpenStudy (anonymous):

What is the solution for this inequality? 5x < 45

OpenStudy (anonymous):

hi... where is the inequality?

OpenStudy (anonymous):

5x < 45

OpenStudy (anonymous):

\[x <\frac{ 45 }{5 }\]

OpenStudy (anonymous):

solve

OpenStudy (anonymous):

divide both sides by five and you will get the equation above...then solve

OpenStudy (anonymous):

i have no clue at all how to do any of this kind of math

OpenStudy (debbieg):

If you had 5x=45, would you know how to solve for x?

OpenStudy (uri):

x <45/5 Just divide it @mathematicshead

OpenStudy (anonymous):

45/5=9

OpenStudy (uri):

Yes So x>9 ans

OpenStudy (anonymous):

thank you all very much :)

OpenStudy (debbieg):

Just solve inequalities just like equalities, with the ONE extra rule that: If you multiply OR divide by a NEGATIVE NUMBER, you must FLIP the direction of the inequality sign.

OpenStudy (amistre64):

you dont need any extra rules if you simply apply the negative principle to equalities as well ...

OpenStudy (amistre64):

since = flips to =, it may seem a bit redundant. But its worth the effort to generalize as a rule as opposed to learning different sets of rules.

OpenStudy (debbieg):

I never thought of it that way @amistre64 ..... but good point! :)

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