How do you know when Y is a function of x?

Thereof, how do you know if Y is a function of x?

The Horizontal Line Test The x value of a point where a vertical lineintersects a function represents the input for that outputy value. If we can draw any horizontal line thatintersects a graph more than once, then the graph does notrepresent a function because that y value has morethan one input.

Likewise, how do you know if something's not a function? ANSWER: Sample answer: You can determine whethereach element of the domain is paired with exactly one element ofthe range. For example, if given a graph, you could use thevertical line test; if a vertical line intersects the graphmore than once, then the relation that the graph represents isnot a function. 56.

Secondly, what does it mean when Y is a function of x?

The phrase "y is a function of x" meansthat the value of y depends upon the value of x, so:y can be written in terms of x (e.g. y = 3x ).If f(x) = 3x, and y is a function of x (i.e. y= f(x) ), then the value of y when x is 4 isf(4), which is found by replacing x"s by 4"s .

How do you determine whether the relation is a function?

Determining whether a relation is afunction involves making sure that for every input there isonly one output. In order for a relation to be called afunction, each X value must have exactly one Y value. X hasto have exactly one Y value.