Read the question aloud
Open the accessibility toolbar to change fonts and contrast, access a dictionary, use a ruler and more
Functions are rules that link inputs and outputs. In a function, each input has only one corresponding value of an output.
Here is an example of a function with a rule times by 2.
The picture below does not show a function, just a relationship between numbers. This is because 1 is linked with two outputs, and in functions, each input must have only one corresponding output.