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Old 08-22-2012, 08:20 PM   #1 
Pogthefish
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Quick math question.

Hey, soI'm doing math andf its been all summer, and like I forget, if you have a problem like ummm -9= 10x + 5(x+9)-7 and you want to divide by 10 to get rid of the 10x do you divide the rest of the problem by 10 too, or just x? I know if its 10x times the rest of the problem you dont, but.. yeah.

I would have asked on y/a but i think I woul dhave gotten distracted while I was there :P I have REALLY bad adhd
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Old 08-22-2012, 08:22 PM   #2 
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ALSO say you have -9=8(x+9)-5 what the hek do you start with? I can't concentrate, just give me the first step?

btw I LOVE the number 9 and 5 today :D
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Old 08-22-2012, 11:53 PM   #3 
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I'm sorry I can't help you. It looks like something I've never seen before. Is it algebra?
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Old 08-23-2012, 12:01 PM   #4 
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ooooh, that makes my head hurt looking at it! I'm sooo happy math wasn't mandatory after gr. 11, I dropped it 5 years ago and never looked back...


I can always ask my sister if I see her today, she's pretty good at math.
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Old 08-23-2012, 12:13 PM   #5 
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You people are helpful... :P
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Old 08-23-2012, 02:57 PM   #6 
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Pogthefish, if you have -9= 10x + 5(x+9)-7, you cannot divide by 10 until you have isolated the 10x. Then you divide BOTH sides by 10. So, yes. You are correct. :)
For example, I am assuming you are solving for x, yes? If you are, then here are the steps to take:

Step one (multiply 5(x+9)) so that you get:

-9=10x + 5x+45 - 7

Step two (add up the numbers and add up the numbers with x):

-47 = 15x (I passed all the numbers to the left side of the equal sign)

Step three (divide BOTH sides by 15):

-47/15 = 15x/15

Step four (simplify):

-47/15 = x (15/15 becomes 1) :)

I hope this helps! Let me know if you have any questions.
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Old 08-23-2012, 05:31 PM   #7 
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I will try to do the second one myself now, but I might need help, lol
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Old 08-23-2012, 05:31 PM   #8 
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Well I will try laer because my hmework is in the car which is idk where -_-
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Old 08-23-2012, 06:46 PM   #9 
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Haha. Sure! Let me know if you figure it out/need help. :)
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Old 08-23-2012, 08:44 PM   #10 
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Will do tomorrow (I love to procrastinate)
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