Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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Solving a System of Linear Equations in Two Variables - Problem 17

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Solving a System of Linear Equations in Two Variables - Problem 16

Alissa Fong
Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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The digits of a number are all multiplied by some power of ten: the hundred's place is multiplied by 100, the ten's place is multiplied by 10, the digits place is multiplied by 1, the tenths place is multiplied by 0.1, etc. If you're faced with a word problem involving re-arranging the digits of a number, many students will write the number as xyz, but be confused because that notation technically means x times y times z. Try instead to represent your number as 100x + 10y + 1z . If the digits get rearranged, your second equation will have each variable multiplied by some other power of ten.

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