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automaticloveletter
 one year ago
Jordan wants to solve the following system using the elimination method:
2x + 3y = 10
x + y = 7
What number should the equation x + y = 7 be multiplied by to eliminate y?
−2
2
−3
3
automaticloveletter
 one year ago
Jordan wants to solve the following system using the elimination method: 2x + 3y = 10 x + y = 7 What number should the equation x + y = 7 be multiplied by to eliminate y? −2 2 −3 3

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Do you want to know how to do the problem automaticloveletter?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0The aim of the game so to speak when using the elimination method is to cancel out one of your variables. In this case we want to eliminate the y variable so we will be focusing on that variable.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Remember when you have an equation like this:dw:1436827766595:dwand you subtract five on both sides to solve for y?dw:1436827785621:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0well when you put the opposite of a number underneath the original, it goes away. The y on that side is all alone.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0In your equations, we have a 3y in the first equation and then a y underneath it in the second equation. We want to get that y underneath it to be the opposite of the 3y on top. What is the opposite of 3y?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0The opposite of 3y is 3y. But we can't just stick a 3 beside the y and call it a day. "What ever you do to one side you have to do to the other". That was a quote by my math teacher that I heard at least a billion times. And it holds relevance to this problem here. To get a 3 next to the y, we have to multiply them together. We can't just multiply those two terms though, we have to multiply the entire bottom equation by 3.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1436828207705:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Now, we have to add the two equations together. After you do this, you will get:dw:1436828310595:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Sure enough, multiplying the entire bottom equation by 3 cancelled out the ys just like we hoped.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Your final answer would be 3. The first person that answered was wrong. I hope you didn't follow his/her answer without testing the work first. I want to be clear: I'm not hating on that person, everyone makes mistakes. :) You just have to be careful. :)
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