Functions & RelationsATI TEAS 7 cheat sheet

Input to one output

6 key facts Reviewed Oct 2026

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Definition

Each input has exactly one output
Domain = all inputs; range = all outputs

Notation

f(x) means 'the output at x'
f(3) = 2(3) + 1 = 7

Vertical Line Test

If a vertical line crosses the graph twice, it is not a function

Linear

f(x) = mx + b — constant rate of change

Key takeaway

Input to one output

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