# How do you use the vertical line test to show #x^2=xy-1# is a function?

##### 1 Answer

Jun 15, 2018

#### Explanation:

Let's solve in terms of

now is this a function, let's look at the graph:

graph{y=x+1/x [-10, 10, -5, 5]}

if you draw a vertical line anywhere across the domain of this graph (all