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02-16-2011, 12:21 PM | #1 |
Donating YT 500 Club Member Join Date: Feb 2009 Location: Weymouth, Ma
Posts: 2,584
| math help for my daughter ALGEBRA y=3/4x-8 y=-1/2-3 can anyone help???
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Welcome Guest! | |
02-16-2011, 12:34 PM | #3 |
♥Max & Lily♥ Donating Member Join Date: Aug 2009 Location: Orlando, FL, US
Posts: 2,186
| hmmm....might have to ask my daughter
__________________ My little dog - a heartbeat at my feet. ~Edith Wharton Lesley, Maximilian & Lily Rae Last edited by orlnurse; 02-16-2011 at 12:35 PM. |
02-16-2011, 12:35 PM | #4 |
Donating YT 500 Club Member Join Date: Feb 2009 Location: Weymouth, Ma
Posts: 2,584
| LOL , I have 2 older ones who are LONG out of High School, wish they were here to help.. algebra was NOT my thing either... LOL..
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02-16-2011, 12:42 PM | #5 |
Yorkie Yakker Join Date: Mar 2010 Location: sacramento
Posts: 64
| What exactly are you trying to solve in the equation. I could help but i need more info? PM me |
02-16-2011, 12:47 PM | #6 |
Donating YT 500 Club Member Join Date: Jun 2010 Location: Gainesville, VA
Posts: 1,173
| I'm sitting at work bored an actually had fun trying to solve it, I miss school Are you trying to get x though? It's been so long since highschool lol...sigh
__________________ Kelly, mommy to little Oliver "The more boys I meet, the more I love my dog." http://www.eat-yourself-skinny.com/ |
02-16-2011, 12:55 PM | #7 |
Donating YT 500 Club Member Join Date: Dec 2005 Location: Saskatchewan
Posts: 3,154
| I wrote this down quickly so I'm not sure if it's the right answer but it was a nice quick break from work (I love math, I'm a geek) Since you know what y is, you insert that value for y and you get: -1/2-3 = 3/4x-8 First, you need common denominators if you want to add/subtract fractions. since the only fraction we need to worry about right now has a 2 on the bottom, put a 2 on the bottom of the other numbers we need to add an subtract. 3 becomes 6/2 and 8 becomes 16/2. Same value, just a common denominator. I'll put brackets around the fractions so they're easier to decipher in computer type. You end up with: -(1/2) - (6/2) = (3/4x) - (16/2) Now you can easily simplify the left side. You add or subtract the top numbers, so -1 - 6 = -7. Your new value for that side becomes -7/2: -7/2 = (3/4x) - (16/2) Simply add the 16/2 to both sides, which cancels it out on the right side and adds it to the left side. The bolded numbers cancel each other out and equal 0: -(7/2) + (16/2) = (3/4x) - (16/2) + (16/2) Add the -7 + 16 to end up with 9/2 on the left side: 9/2 = 3/4x If you multiply 4x (in fraction form, 4x/1), the 4x will cancel out on the right side: (9/2) * (4x/1) = (3/4x) * (4x/1) When multiplying fractions, you can multiply straight across - top number times top number, over bottom number times bottom number. 9 * 4x = 36x, and 2 * 1 = 2. You end up with 36x/2: 36x/2 = 3 Now you can divide 36 by 2 and you end up simplifying to 12x: 12x = 3 To get x alone, you must divide both sides by 12: x = 3/12, or simplified to x = 1/4
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02-16-2011, 01:07 PM | #9 | |
And Rylee Finnegan Donating Member Join Date: Apr 2007 Location: Metro Detroit, MI
Posts: 17,928
| Quote:
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02-16-2011, 01:39 PM | #10 |
YT 1000 Club Member Join Date: Apr 2010 Location: Winnipeg, MB, Canada
Posts: 1,795
| Isn't this kinda cheating? I remember doing that crap, it was horrible. I HATE fractions. I'm glad business students are allowed to have calculators and Excel.
__________________ Kendra Harley, you were the light in my life, rest peacefully my love! |
02-16-2011, 02:21 PM | #11 |
Yorkie Yakker Join Date: Mar 2010 Location: sacramento
Posts: 64
| Actually it is wrong. X=6 9/2 = 3/4x Up to this point you are correct. However you simply need to multiply by 4 not 4x. Thus you should get 36/2 = 3x Simplified is 18 = 3x 18/3 = X X=6 If you multiply 4x (in fraction form, 4x/1), the 4x will cancel out on the right side: (9/2) * (4x/1) = (3/4x) * (4x/1) When multiplying fractions, you can multiply straight across - top number times top number, over bottom number times bottom number. 9 * 4x = 36x, and 2 * 1 = 2. You end up with 36x/2: 36x/2 = 3 Now you can divide 36 by 2 and you end up simplifying to 12x: BTW...Dividing 36x/2 gives 18x NOT 12x 12x = 3 To get x alone, you must divide both sides by 12: x = 3/12, or simplified to x = 1/4 |
02-16-2011, 02:24 PM | #12 | |
Donating YT 500 Club Member Join Date: Dec 2005 Location: Saskatchewan
Posts: 3,154
| Quote:
I assumed the 4x was on the bottom, as in (3)/(4x) ... if she meant (3/4)x, then you are correct, you would just multiply by 4 because that would make it 3x/4
__________________ Lindsey and Layla, Lucy, and Kash | |
02-16-2011, 02:25 PM | #13 |
Donating YT 1000 Club Member Join Date: May 2009 Location: Canada
Posts: 4,923
| Algebra!?? Eeeeeeeeeeek!!!!! *runs away*
__________________ Darlene Bailey Blu & Jesse Bee |
02-16-2011, 02:27 PM | #14 |
Donating YT 500 Club Member Join Date: Dec 2005 Location: Saskatchewan
Posts: 3,154
| I mean, used the 3 in the next step, not that dividing was the next step Just to clarify!
__________________ Lindsey and Layla, Lucy, and Kash |
02-16-2011, 02:29 PM | #15 | |
Yorkie Yakker Join Date: Mar 2010 Location: sacramento
Posts: 64
| Quote:
Oh i see. I was under impression that it is (3/4) x. Either way, the logic is solved given whatever equation. | |
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