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Lesson 6: Equations of proportional relationships

Writing proportional equations

Sal figures out the constant of proportionality when dealing with a constant rate.

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• who else doesnt pause the video
• not me
• I am still confused
• All you have to do is divide the numbers given and put the number you get in between two variables! ex d=8.5h
• "Scarlett is playing a video game. She spends 900 minerals to create 18 workers. Each worker costs the same number of minerals.

Write an equation to describe the relationship between m, the amount of minerals, and w, the number of workers."

For this Question, my equation was: m=50w, and it marked me wrong. Isn't it supposed to be correct because for each worker she uses 50 minerals.
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My work: I started off with 900/18 to find the unit rate, (50) and found out that that was the number of minerals used to make 1 worker. You need to multiply 50 by the number of workers to find out the total amount of minerals you used up. I am right, right?
• Hmmm... that does seem correct... Did you check what they had the answer as? Perhaps they wanted it to be w=?m, since that would tell how many minerals per worker, and how much of the minerals goes toward each worker. I am not sure, but it is always a good idea to check through Khan Academy's work, so you can see what could've gone wrong!! I bet this didn't really help very much, sorry!
• I've watched this thing like 3 times and it still says I didn't do it.
• Samee
• How can you use rates and proportional relationships in the real world?
• i watched this 5 times and it says it is unfinished!!1111
• You have to watch through the entire thing without skipping any parts.
• If anyone reads this have a blessed wonderful day,”Have a nice day
• no thanks
• A unicorn daycare center requires there to be 2 supervisors for every 18 baby unicorns.
Write an equation that shows the relationship between nnnn, the number of supervisors, and uuuu, the number of baby unicorns.
Please note that this is a magical daycare center, so fractional supervisors are allowed.

do they cut a supervisor in half and take it with them?