yego.me
💡 Stop wasting time. Read Youtube instead of watch. Download Chrome Extension

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.

More Articles

View All
Lecture 2 - Team and Execution (Sam Altman)
Uh, before I jump into today’s lecture, I wanted to answer a few questions people emailed me. They said they had questions about the last lecture that we didn’t have time for. So if you have a question about what we covered last time, I’m welcome to answe…
The Inspiration Pt. 1 ft. Zedd | One Strange Rock
ZEDD: I think every little detail you add into a song is part of the reason why you like it so much. Hey, Anton, what’s up, man? Good, how are you doing? Hey, welcome to “One Strange Rock.” Thank you. There’s some really crazy footage I want you to see.…
Quadratic approximation formula, part 2
Line things up a little bit right here. All right, so in the last video, I set up the scaffolding for the quadratic approximation, which I’m calling q of a function, an arbitrary two-variable function which I’m calling f. The uh, the form that we have rig…
The Holocaust | World History | Khan Academy
In this video, we’re going to talk about what is one of the darkest chapters in human history: the Holocaust, which involved the massacre of roughly 6 million Jews and as many as 11 million civilians in total. In order to understand the Holocaust, we’re g…
She Shoots, She Scores: Title IX Turns 50 | Podcast | Overheard at National Geographic
Um, I’m Amy Briggs. It is Wednesday, April 13th, I think, and I am in Princeton, New Jersey, and I’m walking down Prospect Avenue, which is the street where all the eating clubs are. So, eating clubs on a sunny spring day, I took a walk down memory lane. …
fly with me from CA to AZ | tiny airplane, big adventure! day 1
Hi, I’m Stevie, and this is my 1949 Cessna 140A that we’re going to be flying all the way from California to Wisconsin for EAA Air Venture. If you’re not familiar, Air Venture is like the pilot event every single year. 600,000 people and over 10,000 plane…