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**Hannibal lecter****Member**- Registered: 2016-02-11
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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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Do you mean an acute angle with the positive x-axis?

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**Hannibal lecter****Member**- Registered: 2016-02-11
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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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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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**Hannibal lecter****Member**- Registered: 2016-02-11
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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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What would two parallel lines look like?

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**Hannibal lecter****Member**- Registered: 2016-02-11
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| | like these ,

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**Hannibal lecter****Member**- Registered: 2016-02-11
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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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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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**Hannibal lecter****Member**- Registered: 2016-02-11
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I really don't know

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

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**Hannibal lecter****Member**- Registered: 2016-02-11
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no that is the problem

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Let's look at this picture.

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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**Hannibal lecter****Member**- Registered: 2016-02-11
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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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**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
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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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**Hannibal lecter****Member**- Registered: 2016-02-11
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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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**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
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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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