Linear equation word problem | Linear equations | Algebra I | Khan Academy

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Learn how to solve a word problem by writing an equation to model the situation. In this video, we use the linear equation 210(t-5) = 41,790.

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Algebra I on Khan Academy: Algebra is the language through which we describe patterns. Think of it as a shorthand, of sorts. As opposed to having to do something over and over again, algebra gives you a simple way to express that repetitive process. It's also seen as a "gatekeeper" subject. Once you achieve an understanding of algebra, the higher-level math subjects become accessible to you. Without it, it's impossible to move forward. It's used by people with lots of different jobs, like carpentry, engineering, and fashion design. In these tutorials, we'll cover a lot of ground. Some of the topics include linear equations, linear inequalities, linear functions, systems of equations, factoring expressions, quadratic expressions, exponents, functions, and ratios.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

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i learn more from a 6 minute khan academy video than a 1 1/2 hr math class period tbh.

David-mppc
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Why can't McDonald just count the trees himself!

ilianastenovitch
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What boggles me is how good you're at writing in a computer

cijae
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I find it weird that I can’t seem to grasp a concept during an hour long lecture, yet someone on YouTube in a 10 minute video can easily explain it.


Good jerb!

sirnesbit
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in school we were always allowed to use calculators to divide etc but I appreciate that you show us long division and solve the math out loud. sometimes i think "math is so much work" but when you verbalize the process, it becomes less intimidating. thank you.

elinag
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This is _not_ the Old MacDonald that I remember...

stone
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now i can understand algebra!!!
thanks

lorenavelazquez
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Just came here for a question. He did all this complex stuff. I did it so much simpler and got the same answer:

let x represent the # of trees initally
let y represent the # of trees now

Therefore x = y + 5

y = 41 790 / 210
x = y + 5

y = 199
x = 204

Therefore the number of trees macdonalds farm initially had was 204.

kylemeade
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I'm in eighth-grade and doing algebra 1. This really helps because I'm a year younger than everyone else in my class.

ParkerGrigsby
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(41790/210)+5 = total initial number of trees. As Feynman once said, « why would you do it by algebra if you can do it much easier by arthmetic? ». I find that this is also applies to this situation very well!

HeyItsKora
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woo hoo im gonna have a mental breakdown due to how much work i have to do by 11:59 and how hard this is
quarantine is great

michaelmelendez
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Thankyou Mr.Khan. I really have troulble with algebretic word problems. Your video was the best and pretty much the only helpful video I found. :)

craftygirl
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How to make a video 6 minutes long: divide for 3 minutes. I understood a lot btw

nott.haseeb
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I did it a simpler way. I don't know if it counts as "linear equations" but this is what I did

Let t represents the number of trees

210(t-5)= 41790
210t-1050=41790
210t=41790+1050
210t=42840
210t/210 = 42840/210
t=204

TheMinecraftDJStudio
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TBH i learn a lot from this video, i am watching this video because my teacher in math is not teaching us.

king_kuro
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Pov: your math teacher made you watch this.

allenreviews
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I find it funny how I learned more from a 5 min video that from a 47 minute math class

skimmingwitholdoliver
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Thanks now I can start on trigonometry for the GED test

dontahawkins
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My teacher always taught us the short cut ONLY it's terrible, I'm glad I found this video teaching the original way since I grew up doing math like my parents and not how we do it now.

alicedreameater
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Your voice sounds like Tyrion Lannister from Game of Thrones.

baura