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Lesson 8: Writing algebraic expressions introduction

# Writing algebraic subtraction expressions

In this lesson, we learned how to turn word statements into algebraic expressions. We practiced with examples like "two less than x" and "y fewer than three." Understanding how to translate words into math helps us solve real-life problems and makes algebra more fun! Created by Sal Khan.

## Want to join the conversation?

• this place is amazing. Thank you Khan Academy
• this is very simple. maybe that why no one has commented?
• everyone has tho
• Hey, question here. What if I said x subtracted by y. That would be x - y, simple! (Right? Idk.) SO, what if I said x subtracted from y. What would that be? Thanks!
• x subtracted from y would be y - x.

Have a blessed, wonderful day!
• Instead of x-2 why can't we do 2-x?
• 2-x is incorrect.
Why, yes because X is variable. So X can be sometime 2,6,1 or whatever.
So example:
If 2-x x=5
then 2-5 = -3
sorry, I'm not that good at English.
• When we swap why can't we have it the other way like when we have x-2 why can't it be 2-x i know it is incorrect already but it is still a question?
• If you have 7 apples for sale and I buy 4, you still have three apples. That's 7-4= 3. If you have 4 apples for sale and I buy 7, not only do you have no more apples, but you still owe me 3 apples because I gave you the money for 7, and you only gave me 4. That's 4-7 = -3. They're all the same numbers, but in different orders, giving us vastly different results.
• I have no questions
• what is triply m
• Don't know.