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10 cards from this deck
Pairs of equations solved together to find variable values
Easy: both linear. Tricky: one linear, one quadratic
Coordinates where graphs intersect
Elimination method
Substitution method
ax+by=cax + by = cax+by=c
When coefficients have the same sign
When coefficients have opposite signs
Linear: 1 solution. Quadratic: typically 2 solutions
Catches errors and confirms solution is correct
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