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#1 2016-12-24 05:54:40

Hannibal lecter
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may anyone solve this equation for me please ?

find a slop of the line that make a cute angel θ=

,,

what is this?

Last edited by Hannibal lecter (2016-12-24 06:28:34)


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#2 2016-12-24 07:50:41

zetafunc
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Re: may anyone solve this equation for me please ?

Do you mean an acute angle with the positive x-axis?

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#3 2016-12-24 09:26:40

Hannibal lecter
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Re: may anyone solve this equation for me please ?

I really this all of the details about the question,, any way forget it I'll find an answer but please answer this one for me :-

(find the equation for line passing through the point (1,2) and parallel to the line : x+2y=3?)


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#4 2016-12-24 09:53:42

zetafunc
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Re: may anyone solve this equation for me please ?

Firstly, you'll want to find the slope of that line. Then, any line parallel to that one will have the same slope. Can you find the slope of the line with equation x + 2y = 3?

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#5 2016-12-24 10:09:25

Hannibal lecter
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Re: may anyone solve this equation for me please ?

I really forget how to find the slope in this situation, I just know : the slope = Δy/Δx, I know that law but I don't understand it ,, anyway

second : I want to know why any parallel lines will have same slope? I need to understand this and to take advantage from this in the future ...

Last edited by Hannibal lecter (2016-12-24 10:11:21)


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#6 2016-12-24 10:10:39

zetafunc
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Re: may anyone solve this equation for me please ?

What would two parallel lines look like?

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#7 2016-12-24 10:11:56

Hannibal lecter
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Re: may anyone solve this equation for me please ?

| | like these ,


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#8 2016-12-24 10:19:14

Hannibal lecter
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Re: may anyone solve this equation for me please ?

they have a θ if 90°?

but not just that

if that so, can we say all lines in the world space have θ=90° are parallel?

Last edited by Hannibal lecter (2016-12-24 10:20:39)


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#9 2016-12-24 10:31:35

zetafunc
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Re: may anyone solve this equation for me please ?

Hannibal lecter wrote:

| | like these ,

Yes. And what are the slopes of those lines?

Hannibal lecter wrote:

they have a θ if 90°?

No, those are called perpendicular or orthogonal lines.

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#10 2016-12-24 10:32:57

Hannibal lecter
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Re: may anyone solve this equation for me please ?

I really don't know


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#11 2016-12-24 11:13:35

zetafunc
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Re: may anyone solve this equation for me please ?

Do you understand why the lines |, | have the same slope?

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#12 2016-12-24 11:58:13

Hannibal lecter
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Re: may anyone solve this equation for me please ?

no that is the problem


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#13 2016-12-24 12:13:04

zetafunc
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Re: may anyone solve this equation for me please ?

Let's look at this picture.

04_07_02a_02.gif

Any line of the form y = mx + c will have gradient m. The lines | and | have the same slope because one is the same as the other, just moved to a different location.

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#14 2016-12-24 13:32:14

Hannibal lecter
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Re: may anyone solve this equation for me please ?

yes that is right thanks and now how to find the slop of this, ? I have a point and a line I don't have two points


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#15 2016-12-24 13:41:37

bobbym
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Re: may anyone solve this equation for me please ?

When you have an equation in point slope form like this y = mx + b then m is the slope.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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#16 2016-12-24 13:51:21

Hannibal lecter
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Re: may anyone solve this equation for me please ?

then what is the slop of this x+2y=3

is it 2y=-x+3?
so y= -1/2x + 3/2
is the slope -0.5?


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#17 2016-12-24 13:52:14

bobbym
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From: Bumpkinland
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Posts: 109,606

Re: may anyone solve this equation for me please ?

That is correct.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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