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Mathematics 13 Online
OpenStudy (anonymous):

1/x+1/4=7/12

hero (hero):

\[\frac{1}{x} + \frac{1}{4} = \frac{7}{12}\]

hero (hero):

Subtract 1/4 from both sides. Let me know what you get.

OpenStudy (anonymous):

1/4=7/12-1/x

hero (hero):

You were supposed to subtract 1/4 from both sides, not 1/x

OpenStudy (anonymous):

oh my bad. then it would be 1/x=7/12-1/4

hero (hero):

Good, now multiply 1/4 by 3/3. Let me know what you get.

OpenStudy (anonymous):

why do i multiply by 3/3?

hero (hero):

Because you can't combine the fractions together unless the denominators are the same. Just do it and let me know what you get.

OpenStudy (anonymous):

im not sure.

hero (hero):

What do you mean you're not sure. You don't know how to multiply 1/4 by 3/3?

OpenStudy (anonymous):

no i do! just confused about the 3/3

hero (hero):

After you multiply it, let me know what you get. I'll explain later.

OpenStudy (anonymous):

.25

hero (hero):

?????????????????

hero (hero):

What is \[\frac{1}{4} \times \frac{3}{3}\]

hero (hero):

Just multiply it. Don't simplify it

hero (hero):

I thought you knew how to multiply. If you multiply the above (manually, without using a calculator), you should be able to get an appropriate result.

OpenStudy (anonymous):

3/12

hero (hero):

Finally...

OpenStudy (anonymous):

dont be mean about it. im not stupid.

hero (hero):

Now you have \[\frac{1}{x} = \frac{7}{12} - \frac{3}{12}\] What can you do to the right side now?

OpenStudy (anonymous):

add 3/12 to 7/12?

hero (hero):

There's a huge minus sign between the two fractions. What does that mean?

OpenStudy (anonymous):

so now i have 1/x=4/12

hero (hero):

Okay, now cross multiply

hero (hero):

Let me know what you get.

OpenStudy (anonymous):

12/4x

OpenStudy (anonymous):

is that wrong?

hero (hero):

If you cross multiply, you will get 12 = 4x now divide both sides by 4. Let me know what you get.

OpenStudy (anonymous):

3=x

OpenStudy (anonymous):

thanks for helping me btw

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