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# Systems of equations with elimination: potato chips

Sal solves another system of equations using elimination. Created by Sal Khan.

## Want to join the conversation?

• When Sal says to multiple by -2 couldn't you just multiple by positive 2 and subtract instead of add?
• Yes. It is perfectly acceptable to subtract the equations like you said, so long as you subtract on both sides. This would have given you the same solution as well. Nice observation!
• haha get it? Arbegla? Algebra? GET IT?!?!
• yes it is funny
• honestly arbegla needs to loose his job lol he rarely knows whats going on he ain't smart
• A whole royal advisor, went to the top colleges, but is struggling with POTATO CHIPS!
• : They FORBID children from eating potato chips? That's just wrong lol
• Yes fr
• Is Arbegla's name based off of algebra? "Algebra" spelt backwards is "Arbegla".
• Ohhhh
That's why I felt somthing similar from"arbegla" to "algebra"
UPDATE: I search him on google and can't seem to find him
• People in this kingdom are fat five cupcakes
3 potato chips bags
• perhaps the adults are trying to catch up on the potato chips they missed during their childhood
• Sal, how long did it take you to draw these images in your videos?
• you can scribble the line and make those sketches look "artistic"
• Arbegla backwards is Algebra!
• You'd be doomed to be a mathematician if your first name is algebra
(1 vote)
• How do you solve this equation?
x+y=2
2x+7y=9
• Multiply the first equation by 2, then subtract the second equation. Here:
2x+2y=4
-(2x+7y=9)
0x-5y=-5
-5y=-5
y=1
Now, just plug 1 back into either equation to solve for x.