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.

Iceland's Volcanic World | National Geographic

Showing a potential client our video wall at The Jet Business!

View All

Christopher Columbus part 1

[Voiceover] In 1492, Christopher Columbus sailed the ocean blue and he discovered America, discovered the world was, in fact, round, and he’s a hero, and that’s why we get the day off from work and school and get to celebrate him every October. So, you’ve…

Network is the key to selling corporate jets.

You sell some really expensive stuff. Take us through the process of how you sell it. It takes many, many years of building that network because the network is key. You have to get to know people who have these assets, and you have to convince them to gi…

THE END of Credit Card Signup Bonuses??

Lots of you guys, it’s Graham here. So, you know, unfortunately, I have a little bit of bad news today. You know when you find a way to outsmart and exploit the system for a profit? Eventually, the credit card companies are gonna start to catch on to this…

Drowning in Grain: A Look at the Hidden Dangers of Farming | Short Film Showcase

So we’ve got a situation here with a farmer or child who’s trapped in a grain bin. We’ve got plastic coffers here, and we’ll be placing these on each side of the victim. These are actually going to protect the victim from the corn, to get the corn from co…

A message from Sal Khan for the Khan Academy 2016 Annual Report

Welcome to the KH Academy 2016 annual report. In the actual text of the report, we’re going to go into a lot more detail on the financials and other things, but I’m hoping here to give you an overview, big picture. 2016 was a great year for KH Academy. T…

Buffer capacity | Buffers, titrations, and solubility equilibria | Chemistry | Khan Academy

Let’s talk about buffer capacity. Buffer capacity is a property of a buffer, and it tells you how much acid or base you can add before the pH starts changing. Basically, as your buffer capacity goes up (which I’m going to abbreviate as BC), you can add m…

Solving equations and inequalities through substitution example 2

More Articles