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  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#10551 Re: Exercises » Limits! » 2011-06-30 00:48:53

hi gAr

could you explain how you got the second line in your solution.i don't get it.

#10556 Re: Help Me ! » Solving systems of equations using Substitution method and elimination » 2011-06-29 09:33:05

correct.one tip though,when you get a solution you can always check by pluging the results into the equations.

#10561 Re: Help Me ! » Solving systems of equations using Substitution method and elimination » 2011-06-29 09:04:51

that's right.you're welcome.just watch out to spot your mistakes,but don't worry if you make one,everybody does.

i've wanted to ask you,how old are you?

#10563 Re: Help Me ! » Solving systems of equations using Substitution method and elimination » 2011-06-29 08:49:34

hi zee-f

no actually you would get 0=-1x-2.Grom there you can get x.

#10564 Re: Help Me ! » Solving systems of equations using Substitution method and elimination » 2011-06-29 08:00:19

hi zee-f

problem 17 is incorrect
again,2x-4 is not -2.you didn't make x dissapear.
What you can do is subtract the two equations.
it should be easier that way.

#10565 Re: Exercises » What do you think? » 2011-06-29 02:19:35

i got it from a mathematical magazine.

#10567 Re: Exercises » What do you think? » 2011-06-29 02:06:16

hi bobbym

also missed your post on the small o,big O.
i'm sure that it's a small o

#10568 Re: Jai Ganesh's Puzzles » 10 second questions » 2011-06-29 02:04:05

yeah you're right.i just put 10 instead of 20 by mistake.

#10571 Re: Help Me ! » another question to check please » 2011-06-29 01:48:25

hi silverpuma

i think those are correct answers.

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