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Math
Algebra 1
Linear Equations and Functions
Functions and Relations
When Is a Relation a Function?

Practice problem

When Is a Relation a Function?

By EElise Molinaro

+3 contributors

Contributors

Elise Molinaro
Victor Wang
Alex Federspiel
Trisha

Input to Output
-1 to 4
0 to 2
1 to 4
2 to 10
3 to 20 — Image source: by Elise Molinaro

Which of the following functions is represented above?

Choose one answer

Option A: A

$f(x)=x^2-2$

Option B: B

$f(x)=2x^2-2$

Option C: C

$f(x)=x^2+2$

Option D: D

$f(x)=2x^2+2$

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