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Q: The graph of a function must pass the line test?
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Is an oval a graph of a function?

No, the graph of an oval/ellipse is not a function because it does not pass the vertical line test.


The graph of a relation must pass the vertical line test?

True


How can you decide whether a relationship is linear by studying the pattern in a graph?

The graph must be a straight line, and it must pass through the origin.


How can you tell by examining a graph if a line represents a direct variation?

The graph must be linear and pass thru the origin


What does a one to one function graph look like?

A one-to-one graph must pass both the horizontal and the vertical line test. That means that no x-value can have two y-values and no y-value can have two x-values. An example of a one-to-one function is a line. Things like parabolas and the graph of an absolute function cannot be one-to-one.


The graph of a relation must pass the vertical line test true or false?

False


What two criteria must be true for a graph to be a proportional relationship?

It must be a straight line. It must pass through the origin.


What methodare you going to use in determining that graphs are function or not?

Use the vertical line test...pass a vertical line from left to right across the graph. If you hit the graph more than once at a time, there is x-sharing, and it is not a function.


Does a graph showing direct proportion always have to be a straight line?

Assuming both the scales on the graph are linear (that is to say that the numbers go up evenly) then YES, a graph which shows direct proportion must be a straight line. It must also pass through the origin (0,0). A straight line which does not pass through the origin is NOT showing direct proportion. Duncan


Can a one to one function not be a function?

"y = f(x) is a function if it passes the vertical line test. It is a 1-1 function if it passes both the vertical line test and the horizontal line test. " - In order to be a one-to-one function, it first has to BE a function and pass the vertical line test. For example, a relation on a graph like a circle that does not pass the vertical line test is not function nor one-to-one.


What are the similarities between exponential linear and quadratic functions?

Of the three functions, all three pass the vertical line test. That is, if you draw a vertical line anywhere on the graph that the function is, that line will only pass through the function once. All three are also invertible functions, which means that there is a function that is capable of "undoing" the original function. And because the functions all pass the vertical line test, they are all able to be differentiated.


Is fx -x2 a function?

f(x) = -x2 is a function. The equation is solved with just f(x) on one side, and if you were to graph it, it would pass the vertical line test.