document.write( "Question 1168869: Can anyone tell me if f(x)= -x is a function or not? Thank you! ☺ \n" ); document.write( "

Algebra.Com's Answer #793519 by math_helper(2461) $\"\"$ $\"About$

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It is a function.
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\n" ); document.write( "The test is to graph it and then slide a vertical line along that graph. If the vertical line intersects the graph of f(x)=-x at most once then the equation is a function. The key here is that for each possible input x, there is one corresponding value of f(x). Here is a graph of f(x)=-x with a vertical line for illustration, sliding the line left or right you can see it will only intersect f(x)=-x once:
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