anonymous
  • anonymous
HelloGoodnight -RECIEVE ONE MEDAL FOR HELPING- QUESTION IN POST
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
Nnesha
  • Nnesha
goodnight. have a nice dreamz
anonymous
  • anonymous
\[1/5(X-15)+1/9(X+9)=X+7\]
anonymous
  • anonymous
@wolf1728 I don't know how to do this . Do you think you can help me solve it.

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wolf1728
  • wolf1728
I made a better graphic of the problem:
1 Attachment
wolf1728
  • wolf1728
That becomes 1/(5x -75) + 1/(9X +81) = x + 7
anonymous
  • anonymous
Okay so can you tell me whats the next step
wolf1728
  • wolf1728
We could multiply both sides by (5x -75) and get 1 + (5x -75) / (9x + 81) = (x +7) * (5x -75)
anonymous
  • anonymous
Thats the answer or is that step 1
wolf1728
  • wolf1728
That's step 1 I'm guessing you have to solve for x right?
anonymous
  • anonymous
Okay and yep its solving the equation
anonymous
  • anonymous
What's next . Sorry I'm trying to figure out this step
wolf1728
  • wolf1728
Here's the next step
1 Attachment
anonymous
  • anonymous
Okay Can you tell me if 1/13 is the answer. I think I'm doing it right but I'm not sure
wolf1728
  • wolf1728
I'm working this out as we speak - I don't have the answer yet. I think I've found a quicker way.
anonymous
  • anonymous
Okay !
wolf1728
  • wolf1728
I am trying to find a way to get rid of the "1" or the (5x-75) but something always gets left over
anonymous
  • anonymous
Okay let me see too
anonymous
  • anonymous
I have the answers but I need to know the steps on how to get them so I can understand it
anonymous
  • anonymous
kaun academy bro that will help u
wolf1728
  • wolf1728
I'd say the next step MIGHT be multiplying 5x^2 -40x -526 by (9x +81) That would produce a cubic equation equaling (5x -75) which would be difficult to solve. Something should be cancelling here.
anonymous
  • anonymous
Yes, How'd you get five x squared
anonymous
  • anonymous
That's thepart I'm kind of confused by
wolf1728
  • wolf1728
Look at the second graphic I posted
anonymous
  • anonymous
Okay
anonymous
  • anonymous
Yeah I still don't get it
wolf1728
  • wolf1728
That's about as far as I can go I could try using Excel to get the answer (which I'm doing right now) but it won't show you the method
anonymous
  • anonymous
Okay that's fine take your time.
anonymous
  • anonymous
@ganeshie8
anonymous
  • anonymous
@wolf1728 Excel is going to be a link too?
wolf1728
  • wolf1728
No Excel is just a program for doing calculations and if you know how to program it, you can set it up to do trial and error computations.
anonymous
  • anonymous
ohhhh ok
anonymous
  • anonymous
http://prntscr.com/8fokd1
Nnesha
  • Nnesha
facepalm **
anonymous
  • anonymous
aha what happen nnesha
Nnesha
  • Nnesha
so x-5 and x-9 are not at the denominator \[\frac{ x-5 }{ 5} +\frac{ x+9 }{ 9}=x+7\] this is your question right ?
wolf1728
  • wolf1728
Aha - that second graphic you posted is different than the other one you posted
Nnesha
  • Nnesha
leftside) find common denominator
anonymous
  • anonymous
Ah sorry wolf but to nnesha its 15 so x-15/5
Nnesha
  • Nnesha
ohh yea sorry 15*
Nnesha
  • Nnesha
what's the common denominator ?
anonymous
  • anonymous
45
Nnesha
  • Nnesha
yes right \[\frac{ 9(x-15)+5(x+9) }{ 45 }=x+7\] multiply the numerator of 1st fraction by the denominator of 2nd fraction (9(x-15)) multiply the numerator of 2nd fraction with the denominator of 1st fraction (5(x+9) now distribute parentheses by outside number 9(x-15) ="?? 5(x+9)=??? after that combine like terms
anonymous
  • anonymous
9+5=14x
Nnesha
  • Nnesha
oh no no you can't add 5 and 9 first you should distribute x-15 by 9 distributive property ? a(b+c) = a*b + a*c =ab +ac
Nnesha
  • Nnesha
9(x-15) = 9 times x + 9 times -15 = ?
anonymous
  • anonymous
Okay question. How come you switched I thought it was suppose to be 5(x-15)+9(x=9)
anonymous
  • anonymous
How come it was switched?
anonymous
  • anonymous
sorry *(x+9)
Nnesha
  • Nnesha
ugh i can't use draw tool >.< well it's like cross multiplication when we find common denominator we should multiply the numerator of `1st` fraction by the denominator of `2nd` fraction |dw:1442104883666:dw|
anonymous
  • anonymous
loll okay I don't 100% understand that but I am gonna go with the flow
anonymous
  • anonymous
9x-75+5x+40
wolf1728
  • wolf1728
How about eliminating the denominators and multiply 45 by (x + 7)
anonymous
  • anonymous
I thought that 45 was the denominators @wolf1728 and how did you get to this other side of the equation
Nnesha
  • Nnesha
ah sorry https://www.mathsisfun.com/numbers/common-denominator.html here read this i've to go i hope other users explain this better than meh XD lol good luck! :=)
wolf1728
  • wolf1728
9* (x-15) + 5*(x+9) = 45 * (x + 7)
anonymous
  • anonymous
nooooo stay pls help me finish the problem i get it just not that part @Nnesha
anonymous
  • anonymous
Ohh okaya @wolf1728
wolf1728
  • wolf1728
That help a little HelloGood Morning?
Nnesha
  • Nnesha
ye but we still have to multiply 9(x-15) + 5(x+9) that's what he didn't understand
wolf1728
  • wolf1728
okay - I'll finish it up if you want me to.
anonymous
  • anonymous
Okay yeah wolf . and yeah thats the part i didnt understand . Go ahead wolf
wolf1728
  • wolf1728
Okay now we have 9* (x-15) + 5*(x+9) = 45x + 315
wolf1728
  • wolf1728
You see that right?
anonymous
  • anonymous
okay where'd you get 315 from
wolf1728
  • wolf1728
Multiply 45 * (x + 7) you get 45x + 315 (which is 45*7)
anonymous
  • anonymous
okay got that.
wolf1728
  • wolf1728
Okay so now we do a little multiplying 9* (x-15) + 5*(x+9) = 45x + 315 that equals 9x -135 can you multiply 5*(x +9)?
anonymous
  • anonymous
5*x=5x and 5*9=45 5x+45
anonymous
  • anonymous
where'd the 135 come from
wolf1728
  • wolf1728
That's right so we now have 9x -135 + 5x +45 = 45x +315
wolf1728
  • wolf1728
I multiplied 9 *(x -15)
anonymous
  • anonymous
okay
wolf1728
  • wolf1728
Now we have to collect the terms in this: 9x -135 + 5x +45 = 45x +315
anonymous
  • anonymous
okay 9x+5x=14x
wolf1728
  • wolf1728
So, we have 14x -135 + 45 = 45x + 315
anonymous
  • anonymous
yeah so 45x-14x =31x
wolf1728
  • wolf1728
Very good so we now have -135 + 45 = 31x + 315
anonymous
  • anonymous
yay!
wolf1728
  • wolf1728
There's more to do though
anonymous
  • anonymous
-135+45=-90
anonymous
  • anonymous
lol yeah sorry i was celebrating
anonymous
  • anonymous
-90=31x+315
wolf1728
  • wolf1728
-90 = 31x + 315
wolf1728
  • wolf1728
Very good and now?
anonymous
  • anonymous
Okay -90+315=225
anonymous
  • anonymous
225/-31
wolf1728
  • wolf1728
No not quite yet. -90 = 31x + 315 Now let's add -315 to both sides
anonymous
  • anonymous
oh -90+-315=-405
wolf1728
  • wolf1728
Right so, -405 = 31x
wolf1728
  • wolf1728
and then x equals ?
anonymous
  • anonymous
okay so x=-405/-31 !
wolf1728
  • wolf1728
Yes and if we calculate that it equals -13.064516129
anonymous
  • anonymous
yossssss
anonymous
  • anonymous
You're the greatest
wolf1728
  • wolf1728
So now you have your answer!
wolf1728
  • wolf1728
Shucks, thanks :-)
anonymous
  • anonymous
loll You're welcome but really Thank you !
wolf1728
  • wolf1728
you are welcome - glad I stuck it out to get you the answer
anonymous
  • anonymous
Yes me too like I really appreciate it, my professor said this is going to be the hardest test of the class so i must know the steps
wolf1728
  • wolf1728
okay, now at least you know the steps for this problem. Sorry, I started out with the wrong equation.
anonymous
  • anonymous
@wolf1728 I'm sorry to bother you but I have one more problem and it's not as hard as the first one i promise. Just need to know these steps . And that's not a problem it was my fault i should've screenshotted it from the jump
wolf1728
  • wolf1728
Yes the screen shot was MUCH easier to read :-)
anonymous
  • anonymous
Agreed!
wolf1728
  • wolf1728
You have another problem huh?
anonymous
  • anonymous
Yeah one more I promise lmao
wolf1728
  • wolf1728
okay make it easy :-)
anonymous
  • anonymous
Okay :)
anonymous
  • anonymous
http://prntscr.com/8fp3ct
anonymous
  • anonymous
Oh hold one sec I wrote it wrong
wolf1728
  • wolf1728
Yes it can't have two equal signs
anonymous
  • anonymous
Yeah i meant an + haha but lets move this question to a new post i'll tag you
wolf1728
  • wolf1728
Okay

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