I am not sure what do for this part of the work sheet... Please help?!

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Learningfreak

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I have to write down the slope intercept form. It says slope-intercept form and the it has a blank line. It shows how to write the slope intercept which is y=mx+b. the slope is -6/14 and there are the points (-3,5) and (11,-1). I wanted to know when it asks for slope-intercept form do I just substitute the variables with the numbers for the answer of that question?? If so, how would i write it. Thanks and I really need help on this cause I want to finish my worksheet soon. Thanks and please answer if u know the answer.
 
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Learningfreak said:
It says talipes intercept form and the it has a blank line.
Click to expand...

Using the [Preview] button to proofread your typing before submission is just one of the suggestions in our Forum Guidelines.

Your statement above is nonsensical. (What is "the it" whose line is blank? Talipes is medical terminology for club foot.)


It show how to write the slope intercept which is y=mx+b.

when it asks for slope-intercept form do I just write in the equation with the number in it for the answer
Click to expand...

You wrote "write the number in it".

If you're trying to say "substitute Real numbers for m and b" in the Slope-Intercept form, then yes, that is what you need to write.
 
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Learningfreak said:
do I just substitute the variables with the numbers
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Okay -- you edited your post.

No, you do not substitute a number for either variable when writing the final answer.

With Slope-Intercept form y = mx + b, the variables are y and x and the parameters are m and b (the constants).

You already found that m = -6/14 (reduce that fraction).

You also need to find the value of b.


EGs:

When m = 5 and b = 2, we write the Slope-Intercept form as: y = 5x + 2

When m = 1/4 and b = -3/4, we write the Slope-Intercept form as: y = (1/4)x - 3/4

This is how we write the equation using known values for m and b.
 
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Here is one lesson link for Slope-Intercept Form, in case you need help on how to find the value of b.

Please read our forum guidelines (there is a link in my first reply).

In the future, try to explain why you're stuck or what you're thinking, specifically. (It saves time.)

Cheers ~ Mark :cool:
 
mmm4444bot said:
Here is one lesson link for Slope-Intercept Form, in case you need help on how to find the value of b.

Please read our forum guidelines (there is a link in my first reply).

In the future, try to explain why you're stuck or what you're thinking, specifically. (It saves time.)

Cheers ~ Mark :cool:
Click to expand...


Okay I read it. And I reduced the slope to -3/7. I am not exactly sure how to find b? All I know is the slope and the points I have in my first post. Couldyou please explain how I can find b? And isn't b the y intercept? I am also confused a bit on that. I've kind of forgot how to solve slope intercept form.
 
Learningfreak said:
isn't b the y intercept?

You are asking if b is not the y-intercept? :wink:
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Symbol b does represent the y-intercept in y = mx + b.

You know the following:

y = -1

x = 11

m = -3/7

If you were to substitute these three values for their respective symbols in y = mx + b, then you would write:

-1 = (-3/7)(11) + b

What do you think about that! :D
 
mmm4444bot said:
Symbol b does represent the y-intercept in y = mx + b.

You know the following:

y = -1

x = 11

m = -3/7

If you were to substitute these three values for their respective symbols in y = mx + b, then you would write:

-1 = (-3/7)(11) + b

What do you think about that! :D
Click to expand...

Oh Okay, I think I kind of get it. Sorry I'm kinda slow at math sometimes. So the first question was to write the slope-intercept form and I would write -1=(-3/6)(11)+b. and then it asks me to find the x-intercept and the y-intercept. How would I so that...? I am not trying to get all the answers straight from you. I am just not sure how to do this and I don't want to do it wrong and then the wrong way to go it will stay in my head.
 
Learningfreak said:
the first question was to write the slope-intercept form and I would write -1=(-3/6)(11)+b

Incorrect
Click to expand...

I previously told you that you need to determine the value of symbol b.

You have not yet found the value of b.

Ask yourself these questions:

"Why did I think that I was finished?"

"Why did I change the slope from -3/7 to -3/6?"


Do you know how to solve -1 = (-3/7)(11) + b to find the value of b?

If not, then you need classroom help.

Cheers :cool:
 
mmm4444bot said:
I previously told you that you need to determine the value of symbol b.

You have not yet found the value of b.

Ask yourself these questions:

"Why did I think that I was finished?"

"Why did I change the slope from -3/7 to -3/6?"


Do you know how to solve -1 = (-3/7)(11) + b to find the value of b?

If not, then you need classroom help.

Cheers :cool:
Click to expand...

Okay I see what you are saying . Except you are using the second set of points. Does it matter which set you use?
 
Learningfreak said:
Does it matter which set you use?
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Not at all. Every line is composed of an infinite number of points. You may use any known (x,y) values, when working with linear equations.

I suggest that, after you think that you have the correct Slope-Intercept form, use the other given coordinates as a check. That is, substitute y = 5 and x=-3 into your equation, do all of the arithmetic, and verify that you end up with a true statement.
 
mmm4444bot said:
EGs:

When m = 5 and b = 2, we write the Slope-Intercept form as: y = 5x + 2

When m = 1/4 and b = -3/4, we write the Slope-Intercept form as: y = (1/4)x - 3/4

This is how we write [Slope-Intercept form] using known values for m and b.
Click to expand...

Would you like to see additional examples of how to express a linear equation in Slope-Intercept form?
 
mmm4444bot said:
Not at all. Every line is composed of an infinite number of points. You may use any known (x,y) values, when working with linear equations.

I suggest that, after you think that you have the correct Slope-Intercept form, use the other given coordinates as a check. That is, substitute y = 5 and x=-3 into your equation, do all of the arithmetic, and verify that you end up with a true statement.
Click to expand...


Okay so either way I should end up with the same conclusion? Sorry that I am not understanding this quickly . ):
 
Learningfreak said:
Okay so either way I should end up with the same conclusion?
Click to expand...

That is correct. There is only ONE LINE that goes through two given points. (You used both points to determine the slope.)

When we know the slope of a line, then one known point is sufficient to "fix" that line as unique -- allowing you to find b. It matters not what the known point is.

You will soon be learning another linear form called the "Point-Slope Form" that uses the fact above.
 
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Learningfreak said:
Sorry that I am not understanding this quickly
Click to expand...

There is no need for apologies. There is also no need to get it "quickly".

Perhaps, you are missing direct instructions (eg: "You need to find the value of b") because you are moving too quickly. If you find yourself not understanding certain statements, don't simply skip over them.

Food for thought.
 
mmm4444bot said:
That is correct. There is only ONE LINE that goes through two given points. (You used both points to determine the slope.)

When we know the slope of a line, then one known point is sufficient to "fix" that line as unique -- allowing you to find b. It matters not what the known point is.

You will soon be learning another linear form called the "Point-Slope Form" that uses the fact above.
Click to expand...

IMG_1275[1].jpgIMG_1276[1].jpg I tried to solve them and I got different answers. I put pictures of them up. Did I do something wrong?
 
Yes and no.

Your first try for finding b is correct, but that value is not exact.

Your second try for finding b has a sign error and an addition error.

You wrote that (-3/7)(-3) = -1.285

A negative number times a negative number always gives a positive result.

You wrote that -1.285 + (-1.285) = 0. That's wrong.

Also, you improperly rounded; the product is 1.286

Are you sure that it's okay with your instructor to work with a decimal approximation for b?

I would not give full credit for this answer: y = (-3/7)x + 3.7143

Do you know how to do arithmetic with fractions? That is, can you simplify either of the following expressions to get a single fraction for b?

5 - (-3/7)(-3)

-1 - (-3/7)(11)
 
NOTE: The dogs are going berserk. I must go for a long walk. Even though the system shows that I am currently logged-in, I am away from my desk for awhile.

Cheers :cool:
 
mmm4444bot said:
Yes and no.

Your first try for finding b is correct, but that value is not exact.

Your second try for finding b has a sign error and an addition error.

You wrote that (-3/7)(-3) = -1.285

A negative number times a negative number always gives a positive result.

You wrote that -1.285 + (-1.285) = 0. That's wrong.

Also, you improperly rounded; the product is 1.286

Are you sure that it's okay with your instructor to work with a decimal approximation for b?

I would not give full credit for this answer: y = (-3/7)x + 3.7143

Do you know how to do arithmetic with fractions? That is, can you simplify either of the following expressions to get a single fraction for b?

5 - (-3/7)(-3)

-1 - (-3/7)(11)
Click to expand...

Are those good?
 

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