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**SE.4 Systems of Equations**

Mystery Box SE.4 Systems of Equations

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LAUNCH Recall how you solved “Coin Quandary” This task is similar.

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**Do not open Your mystery box**

You will get a box with two types of erasers. Star erasers that cost 4¢ each Pencil top erasers that cost 3¢ each Do not open Your mystery box

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Mystery Box

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**Mystery Box Work individually. x = number of star erasers**

y = number of pencil top erasers x + y = total number of erasers 0.04x y = total monetary value of erasers

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Mystery Box Compare with a partner.

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**Mystery Box Let’s share. What is your solution to the mystery? Ask,**

What do you variables represent? How did you come up with that equation?

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**Open Your mystery box Mystery Box**

It’s time to solve the mystery. Were you right? Open Your mystery box

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**©Evergreen Public Schools 2010**

Debrief In the system of equations, you wrote two equations. What does each equation count? When defining your variables, you need to be more specific than “x = star erasers” What do you need to add to your definition of x? ©Evergreen Public Schools 2010

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