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12 cards from this deck
A pair of equations solved together for two unknown variables
At the same time
Easy (two linear) and tricky (one linear, one quadratic)
Two linear equations (unknowns to first power only)
One linear and one quadratic equation
Elimination method
Substitution method
Match coefficients, then add or subtract to eliminate a variable
ax+by=cax + by = cax+by=c
When coefficients have the same sign
When coefficients have opposite signs
Two different solutions (pairs of values)
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