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 Simplicity is Power | Priceless Benefits of Being Simple

Analyzing graphs of exponential functions | High School Math | Khan Academy

View All

Describing numerical relationships with polynomial identities | Algebra 2 | Khan Academy

What we’re going to do in this video is use what we know about polynomials and how to manipulate them and what we’ve talked about of whether two polynomials are equal to each other for all values of the variable that they’re written in. So whether we’re d…

Khan Academy Best Practices for ELA

Hey everyone, this is Jeremy, she a fling at Khan Academy. Thanks so much for joining our session on best practices for using Khan Academy with ELA. To that end, we are very lucky to have Madeline, one of our superstar ambassadors, on the line today to ta…

Taking the Pulse of Our Planet | National Geographic

A lot of our mapping and a lot of our work is about discovery. Still, it’s still that way, but it’s equal now to measurements that will help people make better decisions at a scale that is really important. That scale might be the state of California scal…

Leading and lagging strands in DNA replication | MCAT | Khan Academy

Let’s talk a little bit in more depth about how DNA actually copies itself, how it actually replicates, and we’re going to talk about the actual actors in the process. Now, as I talk about it, I’m going to talk a lot about the three prime and the five pri…

When is the Right Time to Apply to Y Combinator? - Jared Friedman

Hi, I’m Jared. I’m a partner at YC. Before I joined YC, I was a founder of a company called Scribd, which was in the Summer 2006 batch of Y Combinator. The right time to apply to YC is when you have two key ingredients. The first ingredient is you need …

Re: Leap Years, 2012 & The Mayan Calendar

Hello, Internet. A lot of you sent me this image making the rounds which concerns the Mayan prediction that the world will end on December 21, 2012. The claim is that the Mayan calendar short counted the years because they forgot about leap days, so the w…

Solving equations and inequalities through substitution example 2

More Articles