Mystery Box SE.4 Systems of Equations. LAUNCH Recall how you solved “Coin Quandary” 2.

Mystery Box

SE.4 Systems of Equations

2

LAUNCHRecall how you solved “Coin Quandary”

Mystery BoxYou will get a box with two

types of erasers.• Star erasers that cost 4¢

each• Pencil top erasers that

cost 3¢ each

DO NOT OPENYOUR MYSTERY BOX

Mystery Box

Mystery BoxWork individually.

Mystery BoxCompare with a partner.

Mystery Box

Let’s share.

What is your solution to the mystery?

Mystery Box

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

OPEN YOUR MYSTERY BOX

©Evergreen Public Schools 2010

9

DebriefIn 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?