Video: Writing One-Step Linear Equations to Represent Real-World Contexts

Michael wants to buy a video game that costs $70. If Michael has $10, write an equation to represent the amount of money he needs to buy the video game.

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Video Transcript

Michael wants to buy a video game that costs 70 dollars. If Michael has 10 dollars, write an equation to represent the amount of money he needs to buy the video game.

So the video game costs 70 dollars. And we know that Michael already has 10 dollars. And we need to write an equation to represent the amount of money he needs to buy the video game. So let’s let the letter 𝑡, our variable, represent the amount of money that Michael needs.

So he already has 10 dollars. He needs a certain amount more because he doesn’t have enough money. That way, it is equal to 70 because that’s the price of the video game, 70 dollars.

Sometimes it’s common to have the variable written first. So instead of 10 plus 𝑡, we could have 𝑡 plus 10 equals 70. That means the exact same thing. So either of these equations would have worked. However, let’s choose 𝑡 plus 10 equals 70 for our equation.

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