When Khan Academy makes a Borderlands reference

seriously, i am losing my mind right now

At 1:34, when Sal put the three other tiles into the "not used" section, one tile was 0.75p. This made me think that another way to solve the total bill could have been 2p-0.75p. That would have simplified to 1.25p. Is my way of thinking also applicable to the problem?

What does 2P - .75p mean? 2P would be the cost of two ponies, and then you would have had to add 25% tax so that would be 2P(.25) = .50P, so cost of 2 ponies would be 2.50P, divide by 2 to get 1 to be 1.25P. .75P has no meaning within the context of the problem that I can figure out.

This unlearns everything I learnt in elementary

What did you learn in elementary? There is no such thing as a pony made of diamonds?

I'm confused. why is there more then one way to do a problem. so annoying.

I think it's awesome for there to be more than one way. Then you can pick out which way is best for you and then the whole problem will be easier to solve.

What is really a linear expression?

Okay, because nobody has been able to expressly define what a "linear expression" is, but rather they have been defining "linear equation" for you, I'll try to come up with one for you. I can't find any readily available definition of "linear expression" online or I'd direct you to it. So here it goes: A linear expression is one that has a variable in it. Also, no variable is raised higher than a power of 1 or used as a denominator. So you can't divide by a variable. So if a linear equation is commonly expressed as "y= mx+b", a linear expression would be expressed as mx+b. (by definition an expression can't have an equal sign in it or it would be an equation)

Main content

7th grade

Course: 7th grade > Unit 5

Lesson 3: Interpreting linear expressions

Interpreting linear expressions: diamonds

Name: Interpreting linear expressions: diamonds
Uploaded: 2013-08-09T20:31:22Z
Description: We match the expressions to their meaning in this example. We're reinforcing our knowledge of linear expressions.

CCSS.Math:

7.EE.A.2

Google Classroom

We match the expressions to their meaning in this example. We're reinforcing our knowledge of linear expressions. Created by Sal Khan.

Want to join the conversation?

Sort by:

Lamborgini
Posted 10 years ago. Direct link to Lamborgini's post “I'm confused. why is ther...”
I'm confused. why is there more then one way to do a problem. so annoying.
Button navigates to signup pageComment on Lamborgini's post “I'm confused. why is ther...”
(0 votes)
Answer
- buttercup maniac
  Posted 9 years ago. Direct link to buttercup maniac's post “I think it's awesome for ...”
  I think it's awesome for there to be more than one way. Then you can pick out which way is best for you and then the whole problem will be easier to solve.
  Comment on buttercup maniac's post “I think it's awesome for ...”
  (30 votes)
Elijah Foxx Sherman
Posted 4 years ago. Direct link to Elijah Foxx Sherman's post “When Khan Academy makes a...”
When Khan Academy makes a Borderlands reference
Button navigates to signup pageComment on Elijah Foxx Sherman's post “When Khan Academy makes a...”
(18 votes)
Answer
- Threnody Hammond
  Posted 3 years ago. Direct link to Threnody Hammond's post “seriously, i am losing my...”
  seriously, i am losing my mind right now
  Button navigates to signup page
  (15 votes)
Sophie Zhu
Posted 9 years ago. Direct link to Sophie Zhu's post “What is really a linear e...”
What is really a linear expression?
Button navigates to signup pageComment on Sophie Zhu's post “What is really a linear e...”
(0 votes)
Answer
- Klluckman
  Posted 9 years ago. Direct link to Klluckman's post “Okay, because nobody has ...”
  Okay, because nobody has been able to expressly define what a "linear expression" is, but rather they have been defining "linear equation" for you, I'll try to come up with one for you. I can't find any readily available definition of "linear expression" online or I'd direct you to it.
  
  So here it goes: A linear expression is one that has a variable in it. Also, no variable is raised higher than a power of 1 or used as a denominator. So you can't divide by a variable.
  
  So if a linear equation is commonly expressed as "y= mx+b", a linear expression would be expressed as mx+b. (by definition an expression can't have an equal sign in it or it would be an equation)
  Button navigates to signup page
  (37 votes)
Musa Sayed
Posted 5 years ago. Direct link to Musa Sayed's post “At 1:34, when Sal put the...”
At
1:34
, when Sal put the three other tiles into the "not used" section, one tile was 0.75p. This made me think that another way to solve the total bill could have been 2p-0.75p. That would have simplified to 1.25p. Is my way of thinking also applicable to the problem?
Button navigates to signup pageButton navigates to signup page
(6 votes)
Answer
- David Severin
  Posted 5 years ago. Direct link to David Severin's post “What does 2P - .75p mean?...”
  What does 2P - .75p mean? 2P would be the cost of two ponies, and then you would have had to add 25% tax so that would be 2P(.25) = .50P, so cost of 2 ponies would be 2.50P, divide by 2 to get 1 to be 1.25P. .75P has no meaning within the context of the problem that I can figure out.
  Comment on David Severin's post “What does 2P - .75p mean?...”
  (7 votes)
Oli Silver
Posted a year ago. Direct link to Oli Silver's post “This unlearns everything ...”
This unlearns everything I learnt in elementary
Button navigates to signup pageComment on Oli Silver's post “This unlearns everything ...”
(6 votes)
Answer
- David Severin
  Posted a year ago. Direct link to David Severin's post “What did you learn in ele...”
  What did you learn in elementary? There is no such thing as a pony made of diamonds?
  Comment on David Severin's post “What did you learn in ele...”
  (3 votes)
elimcanear
Posted 4 years ago. Direct link to elimcanear's post “does anyone know how to s...”
does anyone know how to switch ur avatar lol 😂😂😂
Button navigates to signup pageComment on elimcanear's post “does anyone know how to s...”
(5 votes)
Answer
🐺Savagewolf30 🥔
Posted 5 years ago. Direct link to 🐺Savagewolf30 🥔's post “Wow, this is harder than ...”
Wow, this is harder than it seems o.0
Button navigates to signup pageComment on 🐺Savagewolf30 🥔's post “Wow, this is harder than ...”
(5 votes)
Answer
Peyton Knowles
Posted 2 years ago. Direct link to Peyton Knowles's post “so if the tax so impotent...”
so if the tax so impotent why did they just do nothing
Button navigates to signup pageButton navigates to signup page
(4 votes)
Answer
- celiajoswoboda
  Posted 9 months ago. Direct link to celiajoswoboda's post “'Cause it's Khan Academy!”
  'Cause it's Khan Academy!
  Comment on celiajoswoboda's post “'Cause it's Khan Academy!”
  (1 vote)
mr B. Bun's
Posted 3 years ago. Direct link to mr B. Bun's's post “how did jack afford the d...”
how did jack afford the diamond horse?
Button navigates to signup pageComment on mr B. Bun's's post “how did jack afford the d...”
(4 votes)
Answer
luckyducky
Posted a year ago. Direct link to luckyducky's post “what does this mean and c...”
what does this mean and can any one explain it differently??
Button navigates to signup pageComment on luckyducky's post “what does this mean and c...”
(3 votes)
Answer

Video transcript

Handsome Jack is buying a pony made of diamonds. The price of the pony is P dollars. And Jack also has to pay a 25% diamond pony tax. Match the expressions to their meaning for Handsome Jack. And they say multiple expressions may fit the same description. So in this bucket, we have the price of the diamond pony before tax. Well, they already tell us that the price of the diamond pony is P dollars. So that's P right over here. Now over here, they say the amount of tax Handsome Jack pays. Well, he pays a 25% diamond pony tax. So whatever the price is, he's going to pay 25% of that. Or another way of thinking about it, he's going to pay 25% is the same thing as 0.25. So 0.25 times P is the amount of tax he's going to pay on this diamond pony. Now, they say Handsome Jack's total bill for the diamond pony. Well, he's going to pay P for the pony plus 0.25P in taxes. So that is this one right over here. P for the pony plus 0.25P for the taxes. So that's that one over there. But if we look at this, you could view this literally as 1P plus 0.25P's. Well, that's the same thing as 1.25P. So that's the same thing as this right over here. So it's 1.25P. And these other three don't seem to fit in any of these categories. So I'm going to put it into the not used. We're required to categorize everything. So let me put this in the not used. It's falling off the screen, I realize. Let me put this in the not used. And then let me put this in the not used. Let's check our answer. We got it right.