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13 cards from this deck
Two unknown variables (usually xxx and yyy)
A pair (x,y)(x, y)(x,y) that satisfies both equations
Infinitely many pairs on the line
One intersection point gives unique solution
When a variable is expressed in terms of the other
Often two solutions
Linear equation (simpler)
As complete pairs: (x,y)(x, y)(x,y)
Both equations linear in standard form
Subtract equations
Add equations
Define what each variable represents
Convert to pence to avoid decimals
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