Solving equations and inequalities through substitution example 2

less than 1m read

·Nov 11, 2024

Mario started the day with five fire flowers. He used some, and now only has three left. If u is the number of flowers he's used, we can write the following equation: how many fire flowers did Mario use?

So, he started with five, he uses some of them, so we subtract the number he used and he ends up with three. There are a bunch of ways that you could do it. One way is you literally could probably do this in your head.

"Hey, I took away some number from five, and I got three!" You probably know, "Hey, well, if I take two away from five, I'm going to get three." So, he used two flowers.

The other way that you could think about doing it is, "Well hey, we got only four options here. Let me substitute each of them in here." Maybe I was able to do this one in my head, but if I had something more complicated, let me try out these choices.

So if he only took a zero away, it'd be five minus zero; he'd still, of course, be left with five. If he took one away, then of course he'd only have four left. If he took three away, he'd have two left. But if you took two away, five minus two is indeed three.

The third way you'll learn this as we go into more of how algebra works, and also the why, is that you could systematically solve it, but we'll go into that in future videos.

So, he used two fire flowers.

Why Do We Dream?

End behavior of algebraic models | Mathematics III | High School Math | Khan Academy

View All

Lagrange multiplier example, part 1

So let’s say you’re running some kind of company, and you guys produce widgets. You produce some little trinket that people enjoy buying. The main costs that you have are labor—you know, the workers that you have creating these—and steel. Let’s just say …

Virus structure and replication | Viruses | High school biology | Khan Academy

In this video, we’re going to talk about viruses, which I think are maybe one of the most fascinating things in biology because they have some aspects of living organisms, but we don’t consider them living. But before we go into the details of it, I want…

TAOISM | The Fasting of the Heart

You hear not with the ears, but with the mind; not with the mind, but with your soul. Confucius. In psychology, as well as popular culture, we see the emerging of different types of detox. The dopamine detox, for example, also called the ‘dopamine fast’ …

Inside the Floating Hospital Helping Flood Victims in Bangladesh | National Geographic

[Music] Bangladesh is actually learning how to adapt to the impacts of climate change faster than any other country in the world because the impacts are happening here, and we’re having to deal with them out of necessity. Emirate Friendship Hospital star…

Finding missing side length when given perimeter | Math | 3rd grade | Khan Academy

The perimeter of the figure is 24 centimeters. What is the length of the missing side? So, we’re told this figure down here has a perimeter of 24 centimeters. The perimeter is 24 centimeters, so what that tells us is that the distance around the entire o…

Limits of combined functions | Limits and continuity | AP Calculus AB | Khan Academy

So let’s find the limit of f of x times h of x as x approaches 0. All right, we have graphical depictions of the graphs y equals f of x and y equals h of x. We know from our limit properties that this is going to be the same thing as the limit as x appro…

Solving equations and inequalities through substitution example 2

More Articles