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10 cards from this deck
Different xxx-values always produce different yyy-values
f(a)≠f(b)f(a) \neq f(b)f(a)=f(b)
If horizontal line intersects graph at most once, it's 1-to-1
Checks if a function is one-to-one
Checks if a relation is a function
All real numbers for which function rule makes sense
Expression under root must be ≥0\geq 0≥0
Denominator cannot equal zero
R\mathbb{R}R (all real numbers)
Not one-to-one (horizontal line crosses twice)
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