Question

The following relations are written as equations. Which one is NOT a.
function?
x = 4
y=4.
x= y +4
y = x +4

Answer 1

Answer:

x = 4

Step-by-step explanation:

doesn't pass the vertical line test

Answer 2

Answer:

x=4

Step-by-step explanation:

Realize that a function can only have one output, y, for each unique input, x.

2 Methods on finding if something is a function or not.

Do the vertical function test

To use the vertical line test, take a ruler or other straight edge and draw a line parallel to the y-axis for any chosen value of x. If the vertical line you drew intersects the graph more than once for any value of x then the graph is not the graph of a function.

Plug in points! See if there are more than one outputs for y