Let's practice matching expressions to their meaning in this example of interpreting linear expressions. Created by Sal Khan.
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- why don't the videos match what the questions are talking about in the actual practice lesson?(11 votes)
- This video uses the actual practice lesson. The format looks different because it is the old format that KA had until a couple of years ago. But the problems do come from the exercise set.(4 votes)
- This video is so confusing that I feel brain dead like Kaminari...somone explain this more simple to me so I don't fry my brain with electric from my headphones because they are dead...(10 votes)
- Thanks for advice. And at least someone understood my joke...I'm just trying to lighten up the mood with comedy from My Hero Academia..And I was trying to be funny, I like making jokes like that.(5 votes)
- What is a linear expression?\(4 votes)
- "It is made up of two expressions set equal to each other. A linear equation is special because: It has one or two variables. No variable in a linear equation is raised to a power greater than 1 or used as the denominator of a fraction."
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- I don't understand why you didn't use 3(3t+4v) isn't it the same, just distributed backwards?(1 vote)
- this isnt helping at all(2 votes)
- Well, it makes sense. Variables also have several unknowns. But it's one of each. 2V + V
V in this case is equal to 1. So the solution is 3V.
And remember the video before. The variable means 1V. V can be anything.(2 votes)
- Solve the equation for x
5x squared minus 4x =6(1 vote)
- I'll assume you mean 5x² - 4x = 6.
First thing to do is to carry the 6 to the left side of the equal sign; 5x² - 4x - 6. Then you factor; in this case, you cannot, so use the quadratic formula and you'll be able to find your x. I hope this will help!(2 votes)
- How did you get 4T + 3V?(1 vote)
- Someone please help! The format of the problem changed and I have problems converting what he said to my problem!(0 votes)
- i dont understand the video can someone help me?some of the problems we get are hard and look nothing like this.(2 votes)
Martin likes to make flower bouquets that each have 3 violets and 4 tulips. If the price of a violet is V and the price of a tulip is T, match the expressions to their meanings. So let's see-- the price of 1 of Martin's bouquets. So one of Martin's bouquets has 3 violets and 4 tulips. So the 3 violets are going to cost 3 times the price of the violet, which is V. So that's the cost of the violets, 3V. And then the 4 tulips are going to cost 4 times the price of a tulip. So that's 4T. So it's 3V plus 4T. So it's not this one. Let's see. This one right over here, this is 4T plus 3V. So this is the price of 4 tulips, 4 times the price of a tulip, plus 3 times the price of a violet. The price of 3 of Martin's bouquets, so it's essentially going to be 3 times this quantity right over here. This is the price of 1 bouquet. We want 3 of them. So it's going to be 3 times the quantity 4T plus 3V. And let's see. If I were to actually multiply this out, 3 times 4T is 12T, and then plus 3 times 3V is 9V. So this is the same thing if I were to distribute the 3-- is 12T plus 9V. Well, that's this right over here. These two are equivalent expressions. And let's see. Are any of these other things equivalent? No, this says 3 times 3T plus 4V. So I'm going to put this in the not used bucket. And then I have-- let's see-- 3V plus 2T. I'm going to put it in the not used bucket. And let's see. This has 2V plus 4T plus V. So if I were to simplify this, if I were to combine the V terms-- if I have two V's and I add another V, that's three V's plus 4T. So this is actually the same thing as the price of 1 of Martin's bouquets. So you could view this as the price of 2 violets plus the price of 4 tulips plus another violet. So it's really the price of 3 violets and 4 tulips. So let's check our answer. We got it right.