Math help

[Contender]

I have an assignment due tomorrow, and I'm struggling with it. Our assignment is to derive the the distance formula.
Find the distance from ax + by + c = 0 to point (x, y).

The answer: d = (ax + by + c ) ÷ SquareRoot(a^2 + b^2)

I need to show the teacher how I came to that answer. Please help.

 

[Contender]

I need it in terms of x, and y.

x = ( (b^2)(x) - (a)(b)(y) - (a)(c) ) ÷ (a^2 + b^2)

y = ?

 

[Kerensky]

derivative of something = dy/dx

keep that in mind...it should help you. Move the terms you need to one side and derive the rest.


In other news, I am happy I get Lincoln's Bday off tomorrow.:cheer:

 

[Damian]

The derivation is incredibly long for something so goddamn simple. Go google it, I'll bet there's someplace that tells you exactly what you need.

-Damian

 

[MrS]

dy/dx of ax + by + c = 0 is

a + b*dy/dx = 0
dy/dx = -(a/b)

?!

integration
derivative is something else i thought
what the **** are you people talking about.

 

[Contender]

i did it already; 3 pgs long lol

 

[immrtlwun]

Just when I thought everyone on this site was retarded in school. I hate Calculus. Integration and derivation are pretty easy by themselves, but the books always give you stupid problems that make you do way too much thinking.

Thanks for hearing out my pissed off rant for the day everybody.