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
Analyzing tables of exponential functions | High School Math | Khan Academy
Let’s say that we have an exponential function h of n, and since it’s an exponential function, it’s going to be the form a times r to the n, where a is our initial value and r is our common ratio. We’re going to assume that r is greater than 0. They’ve g…
How To Stop Living Paycheck To Paycheck
What’s up, guys? It’s Graham here. So, let me tell you a quick story about what just happened. I was going about my day, a normal day, just like any other, and I decided to open up the internet to see what people were talking about, what was happening in …
2d curl formula
So after introducing the idea of fluid rotation in a vector field like this, let’s start tightening up our grasp on this intuition to get something that we can actually apply formulas to. A vector field like the one that I had there, that’s two-dimension…
Filming Fast Hummingbirds: On Location | Hostile Planet
Filming a show like “Hostile Planet” comes with a lot of unique challenges. Check out this from “Behind the Scenes.” OK, ready? One of the aims of “Hostile Planet” was to try and immerse the viewer in the world of the animals. You want to film something p…
The Theory of Information
That was a message found in a half-broken bottle that washed up a shore near a Croatian beach. It had spent nearly 23 years at sea, from the time of writing to the time it was finally found. Who Jonathan and Mary were, and what the message actually means,…
Standard potential, free energy, and the equilibrium constant | AP Chemistry | Khan Academy
For a generic redox reaction, where the reactants turn into the products, the free energy is related to the potential for the redox reaction. The equation that relates free energy and potential is given by: ΔG = -nFE. ΔG is the instantaneous difference …