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#26 2012-06-27 03:01:45

SlowlyFading
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Registered: 2012-06-12
Posts: 149

Re: Follow-up on my last post

I understand what the slope is and what the points are for a point-slope problem for example:

y-4= -3(x-2)
The slope of the equation is -3
The point from this equation is (2, 4)

And the same in slope-intercept.

And I understand how to get the slope-point form from two points. But 1,115.00 and 5,83.00 aren't my points, they're coordinates, right? And I don't know how you draw points from coordinates..


I'm just here to get some help with an online math course I'm taking.

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#27 2012-06-27 03:04:25

bobbym
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From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Follow-up on my last post

Hi;

One thing at a time. You are jumping ahead to things you do not need to answer this question. Please try this one:

An ordered pair that makes up a point is (x1,y1)

Okay, so which one is x1 in (1,115)


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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#28 2012-06-27 03:06:31

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Re: Follow-up on my last post

(x1, y1) then it would be (1, 1).


I'm just here to get some help with an online math course I'm taking.

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#29 2012-06-27 03:08:59

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Follow-up on my last post

Hi;

No, x1 is the first number in the pair (1,115)


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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#30 2012-06-27 03:11:32

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Registered: 2012-06-12
Posts: 149

Re: Follow-up on my last post

x1 is 1?


I'm just here to get some help with an online math course I'm taking.

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#31 2012-06-27 03:12:29

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Follow-up on my last post

Yes! And what is y1?


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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#32 2012-06-27 03:13:40

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Posts: 149

Re: Follow-up on my last post

y1 would be the second number in the coordinates so also 1?


I'm just here to get some help with an online math course I'm taking.

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#33 2012-06-27 03:15:16

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Follow-up on my last post

Hi;

The coordinates are (1,115). The first number is the x coordinate, the second number is the y coordinate. Now, what is y1?


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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#34 2012-06-27 03:17:01

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Registered: 2012-06-12
Posts: 149

Re: Follow-up on my last post

1


I'm just here to get some help with an online math course I'm taking.

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#35 2012-06-27 03:17:49

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Follow-up on my last post

Hi;

What is the second number of (1,115)?


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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#36 2012-06-27 03:18:26

SlowlyFading
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Registered: 2012-06-12
Posts: 149

Re: Follow-up on my last post

5?


I'm just here to get some help with an online math course I'm taking.

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#37 2012-06-27 03:20:24

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Follow-up on my last post

(1,115) are two numbers. 1 and 115. The first number is the x coordinate and the second number is the y coordinate. Later we will look at the graph to understand this. Now, please try agin if x1 = 1 what does y1 equal?


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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#38 2012-06-27 03:21:21

SlowlyFading
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Registered: 2012-06-12
Posts: 149

Re: Follow-up on my last post

115?


I'm just here to get some help with an online math course I'm taking.

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#39 2012-06-27 03:22:46

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Follow-up on my last post

Correct!
So x1 = 1 and y1 = 115.

Remember the formula?


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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#40 2012-06-27 03:27:11

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Registered: 2012-06-12
Posts: 149

Re: Follow-up on my last post

Won't I also need to use the other set of coordinates as well? (x2, y2) = (5, 83)


I'm just here to get some help with an online math course I'm taking.

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#41 2012-06-27 03:28:16

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Follow-up on my last post

Hi;

You will be able to answer that for yourself when you plug in what you already have.


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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#42 2012-06-27 03:50:24

SlowlyFading
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Registered: 2012-06-12
Posts: 149

Re: Follow-up on my last post

So the point-slope form is y + 115 = -32/-2(x - 1) I believe.


I'm just here to get some help with an online math course I'm taking.

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#43 2012-06-27 03:54:59

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Follow-up on my last post

Hi;

No, that is not correct. Let's look at the formula.

The y1 = 115 so just plug it in to the formula where there is a y1.

You try the x1


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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#44 2012-06-27 03:59:29

SlowlyFading
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Registered: 2012-06-12
Posts: 149

Re: Follow-up on my last post

That's the formula I used. I subtracted 83 - 115 and got -32, and subtracted 5 - 1 and got -2.


I'm just here to get some help with an online math course I'm taking.

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#45 2012-06-27 04:01:26

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Follow-up on my last post

Hi;

You are jumping ahead one step at a time will get this done.

Did you see where the y1 went?


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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#46 2012-06-27 04:08:35

SlowlyFading
Member
Registered: 2012-06-12
Posts: 149

Re: Follow-up on my last post

Yes I understand where the y1 went, at least i think I do. You put it in so you could subtract it from the 83 right?


I'm just here to get some help with an online math course I'm taking.

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#47 2012-06-27 04:12:22

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Follow-up on my last post

What 83?


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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#48 2012-06-27 04:15:26

SlowlyFading
Member
Registered: 2012-06-12
Posts: 149

Re: Follow-up on my last post

The y2 83 from the second set of coordinates.


I'm just here to get some help with an online math course I'm taking.

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#49 2012-06-27 04:17:07

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Follow-up on my last post

You only need one set of coordinates we agreed to use (1,115) the (5,83) is not necessary.


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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#50 2012-06-27 04:20:22

SlowlyFading
Member
Registered: 2012-06-12
Posts: 149

Re: Follow-up on my last post

This is the formula my lesson uses:

Example 1: Find the equation of the line through the points (2, -1), (-4, 3)
First, find the slope as we did in lesson 11.
(y2 - y1)
(x2 - x1)
(3 - -1)
(-4 - 2)
(4)
(-6)
So our slope is -2/3

Next, pick one of the points (either one will do) to put into the equation y -k = m(x - h). Be sure to change the signs of the coordinates.

y + 1 = -2/3(x - 2


I'm just here to get some help with an online math course I'm taking.

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