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.

Power dissipation in resistors in series versus in parallel

The water cycle | Weather and climate | Middle school Earth and space science | Khan Academy

View All

Protect the Grass, Save the People (and the Monkeys) | National Geographic

Everybody says grasses are food. Grasses are our clothes. There’s some ownership and some sense, you know? Everybody senses, everybody feels. When dating Wassa Wassa community conservation area, it is a special project. The director of [Music] in many wa…

Introduction to car buying | Car buying | Financial Literacy | Khan Academy

So, you’re looking to buy a car. So, I’ll at least tell you how I would approach buying a car. The first thing is thinking about what you can afford, and I would think about that before you even look at the types of cars you might want to buy. Because it …

Pessimism Appears to Be the Intellectually Serious Position

If you’re an academic of some kind, then being able to explain all of the problems that are out there and how dangerous these problems are, and why you need funding in order to look at these problems in more depth, that appears to be the intellectually se…

#shorts Type-B Dial

So this is a brand known as Loo. There are type A style dials and there are type B style dials. Type B is going to have a different orientation of the hours and minutes. So the hours in this case are on the inside; the minutes are on the outside. That wa…

Shower Thoughts That Keep Me Up At Night

Morning people run. Society, we march to the rhythm of their drumbeat, and yet, on average, they are less intelligent than the night owls. They are, however, more likely to be happy, so let’s call it a draw. A person who coined the term “living room” mus…

Chasing Microbes: The Secret Superheroes of Our Planet | National Geographic

There are places all over the world where methane is coming out of the seafloor. This is kind of concerning because methane is a very strong greenhouse gas. We think a lot about carbon dioxide heating up the planet, but methane is about 25 times worse. An…

Solving equations and inequalities through substitution example 2

More Articles