Is #x = 7# a function?
1 Answer
Explanation:
In mathematics, a function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one output (See https://en.wikipedia.org/wiki/Function_%28mathematics%29#cite_note-1 for more information).
In most graphs with a x-axis and a y-axis, there is only one y-value for every x-value. Take for example
graph{y=x [-10, 10, -5, 5]}
Notice that as you keep going across the graph, the line always continues through the
However,
A vertical line test is often best used to determine a function of a curve. Common equations are inverse trigonometry equations like
Khan Academy has a good series on understanding functions in depth:
https://www.khanacademy.org/math/algebra/algebra-functions.