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For (x=4) on the graph of (f(x)=\frac{1}{x}), what is (y)?

Answer and explanation

Correct answer: (\frac{1}{4})

The direct answer is B: 1/4. The function is f(x)=1/x, and on its graph y=f(x). Substitute x=4: y=1/4. Therefore the point is (4,1/4). Option A, 4, wrongly treats y as equal to x. Option B, 1/4, follows directly from the reciprocal rule. Option C, −4, has the wrong sign and magnitude. Option D, −1/4, has a wrong negative sign; a positive x gives a positive reciprocal. Also, x=0 is not allowed, but x=4 is allowed. Memory cue: for y=1/x, put the given x in the denominator and keep the sign; positive input gives positive output, negative input gives negative output.

Related tags

Relations-FunctionsGraphsReciprocal-Value

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