21. Functions
iGCSE (2021 Edition)
21.01 Functions and relations
Interactive practice questions
True or False?
When working with a function, substituting a certain value of $x$x into the formula gives only one value of $y$y for that value of $x$x.
True
A
False
B
Easy
< 1min
What is the name used to describe a graph where for some value of $x$x, there exists two or more different values of $y$y?
Easy
< 1min
True or False?
A horizontal line can intersect the graph of a function at more than one point.
Easy
< 1min
Consider the following statement:
All relations are functions.
Easy
< 1min
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