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# Definition of Inverse - Problem 4

###### Alissa Fong

###### Alissa Fong

**MA, Stanford University**

Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

A relationship (or relation) between inputs and outputs (usually referred to as x and y) can only be called a function if and only if each element of the input is paired with exactly one element of the output. That is, each x must have only one y, and no x's can be left without a y. Here, we look at input and output relations represented in what's called a "map," or "mapping." To find an inverse, swap all elements of the input and output. The set of all inputs, usually the x's, is called the domain, and the set of all outputs, usually y's, is called the range.

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###### Alissa Fong

M.A. in Secondary Mathematics, Stanford University

B.S., Stanford University

Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.

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