Simple Silly Math question

[Wojtek]

when you multiply 2 numbers you get 98, when you add them you get 21

whats the y=bla equation for this simple problem :)

[Dean]

xXy = 98
x+y = 21

i think..

[atlas]

when you multiply 2 numbers you get 98, when you add them you get 21

whats the y=bla equation for this simple problem :)

xy = 98
x + y = 21

y = 21 - x, thus
x(21 - x) = 98

21x - x^2 = 98 -> x^2 - 21x + 98 = 0

factored:
(x - 14)(x - 7) = 0

x = 14, 7

and thus:
with x = 14 -> y = 21 - 14 = 7
with x = 7 -> y = 31 - 7 = 14

Answers are x = 14, y = 7 and y = 7 and x = 14

[Demigod]

I just guessed and checked. Atlas did it the smart way.

[Epgs]

I love guess and check, but now that I am beyond calculus it doesn't usually work

[7trax]

I love guess and check, but now that I am beyond calculus it doesn't usually work

sometimes i guess on those integral problems where you have to find the volume of an irregular object. it is fun but i get 17s and 26s on my quizzes.

[LeX]

How is this "silly"?

[Wojtek]

because it was easy to figure out .......... for smart people ;)

btw, tnx atlas, exactly what i needed

[Ashed]

Is this your homework, Wojtek?

[Wojtek]

since college kicked me out im doing some homeschooling to catch up.
not exactly my 'homework' but part of the exercises i gotta do

[cowax]

xy = 98
x + y = 21

y = 21 - x, thus
x(21 - x) = 98

21x - x^2 = 98 -> x^2 - 21x + 98 = 0

factored:
(x - 14)(x - 7) = 0

x = 14, 7

and thus:
with x = 14 -> y = 21 - 14 = 7
with x = 7 -> y = 31 - 7 = 14

Answers are x = 14, y = 7 and y = 7 and x = 14

Wow... I remember doing that crap...

O I am so very glad Im not in skool anymore!

[tandoc]

bah, screw you all.. i remember doing that last year.. wasn't hard.. just had to waste so much time doing it >_<

[LeX]

since college kicked me out im doing some homeschooling to catch up.
not exactly my 'homework' but part of the exercises i gotta do
No wonder you got kicked out... :D (no offense, really)

[Epgs]

Ouch, that was brutal lex

[Wojtek]

If you dig this forum, you'll learn I failed Russian. ;)
And since russian lvl1 wasnt available in the next semester I could not sign up for the next semester, thus, had to stay home.
Stupid college policies.

But, college here in quebec isnt the same as college in the states.
We have:
6 years grade school
5 years high school
2 or 3 years of college (3 career, 2 pre-university)
3+ years of university

[LeX]

Ouch, that was brutal lex
I couldn't resist. ;)

Wojtek, you got kicked out just because you failed Russian? Are all colleges like that? If that applies to my school, I would've had two years of vacation. :p

[Wojtek]

They'r retarded, thats all.
Aparantly its fixed now, the whole failing, no course offered, cant sign up ----.