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10 cards from this deck
Pairs of linear equations solved together for common solution
Values of xxx and yyy that satisfy both equations
Infinitely many solutions
Typically one solution that satisfies both
Draw both lines; find where they intersect
mmm is gradient, ccc is y-intercept
Express one variable in terms of other, substitute into 2nd eq
Add or subtract equations to eliminate one variable
When income equals costs
Algebraic gives exact answers, not affected by drawing accuracy
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