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13 cards from this deck
Two equations with two unknown letters
Values must make both equations balance
ax+by=cax+by=cax+by=c
To line up unknown letters vertically
Variable chosen to eliminate
When key letters have same sign
When key letters have opposite signs
Substitute back into original equation
Check answer in both equations
Multiply equations if needed
Re-arrange linear eq to isolate variable
Substitute into quadratic equation
Two possible values
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