Question

Which graph represents y as a function of x?

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Answer 1

The last graph that is a straight line represents y as a function of x

Explanation:

In order for a graph to be considered a function, it can't intercept the same value twice. To test this, use the vertical line test to see if the graph hits the line twice. If it does, then it is not a function. But if the line hits the graph only once, then it is a function.