# data[].attributes.headline
It must pass the horizontal line test: No two values of x can correspond to the same value of y

# data[].attributes.subject
It must pass the horizontal line test: No two values of x can correspond to the same value of y

# data[].attributes.headline
for any input x there is either 1 or 0 outputs, not more than 1

# data[].attributes.subject
for any input x there is either 1 or 0 outputs, not more than 1

# data[].attributes.body
The reverse operation of the function must also be a function, and reflect the original graph. For example, y = x^2 has an inverse relation of y^2 = x. This reflects the original graph. However, it is not a function. If you were to keep it a function, it would simply be y = sqrt(x), but this wouldn't be the inverse of the original graph, as it would just have one side of the curve.

# data[].attributes.headline
it needs to pass the vertical line test so that its a function and it needs to pass the horizontal line test so that the inverse is a function

# data[].attributes.subject
it needs to pass the vertical line test so that its a function and it needs to pass the horizontal line test so that the inverse is a function

# data[].attributes.body
it must be one to one

# data[].attributes.headline
each output equals one input and vice versa

# data[].attributes.subject
each output equals one input and vice versa

# data[].attributes.body
reflected across y=x

# data[].attributes.headline
If the chicken was aligned with the line y=x. They'd look like chicken wings. 

# data[].attributes.subject
If the chicken was aligned with the line y=x. They'd look like chicken wings. 

# data[].attributes.headline
the function reflected over y = x if i remember correctly

# data[].attributes.subject
the function reflected over y = x if i remember correctly

# data[].attributes.headline
Switch around x and y in f(x) and isolate y to find f^-1(x)

# data[].attributes.subject
Switch around x and y in f(x) and isolate y to find f^-1(x)

# data[].attributes.body
i.e. if the original function is x^2 + 2, then the inverse would be sqrt(x-2)

# data[].attributes.body
do all the steps in reverse