Need some math help here

gutharius

Golden Member
May 26, 2004
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Here is the equation:

(y * 0.2) - y = 33500

What is y?

It would be educational to me if you showed how you derived this.

I know this is fairly simple I just can't remember my basic algebra enough to figure out how to do it.
 

StevenYoo

Diamond Member
Jul 4, 2001
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(y * 0.2) is just 0.2y

0.2y - y = 33500

(0.2y - y) is like doing 0.2 - 1, so we get:

-0.8y = 33500

then we divide both sides by -0.8

y = -41875
 

Soccer55

Golden Member
Jul 9, 2000
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0.2*y-y=33500
Factor out a y to get: (0.2-1)*y=33500
Order of operations says do parentheses first so we get -0.8*y=33500
Divide both sides by -0.8 to get your answer of y=-41875

-Tom
 

scorpmatt

Diamond Member
Feb 8, 2001
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Originally posted by: LoKe
It's PEDMAS, not PEMDAS. -,-
Unless you americans are different

was always taught to do the multiplication first, what if there is a 4*5 over a 2? doing the m first makes more sense
 

gutharius

Golden Member
May 26, 2004
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Originally posted by: StevenYoo
(y * 0.2) is just 0.2y

0.2y - y = 33500

(0.2y - y) is like doing 0.2 - 1, so we get:

-0.8y = 33500

then we divide both sides by -0.8

y = -41875

Thank you! I guess I would have got it if I notated it correctly. It was the Multiplication symbol and the minus sign that were causing me fits cause i thought i had to find a way to rectify those first...
 

JoeKing

Lifer
Oct 9, 1999
10,641
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Originally posted by: LoKe
It's PEDMAS, not PEMDAS. -,-
Unless you americans are different

it's interchangable. multiply or divide from the order you see it left to right.
 

akubi

Diamond Member
Apr 19, 2005
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Originally posted by: LoKe
It's PEDMAS, not PEMDAS. -,-
Unless you americans are different

division and multiplication are equivalent. same for addition and subtraction......
 

gutharius

Golden Member
May 26, 2004
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Originally posted by: maziwanka
how old is the OP?

27 Been out of school for 5 years and IT Support does not requeire much math les i am working with excel. Even then it is basic stuff.