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Question

Look at the following table:


Which of the statement is correct regarding the data represented in the table?

A
A is function of X
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B
Y is a function of X
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C
X is a function of Y
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D
X is a function of A
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Solution

The correct option is D X is a function of A
If X is function of Y, then input = Y and output = X
Input Output
Y = 750 X = 500
Y = 1250 X = 750 and 500
Y = 550 X = 1100 and 1200

We have more than one output for a particular input.
Hence, X is not a function of Y.

If Y is function of X, then input = X and output = Y
Input Output
X = 500 Y = 750 and 1250

We have more than one output for a particular input.
Hence, Y is also not a function of X.

If A is function of X, then input = X and output = A
Input Output
X = 500 A = 1 and 3

We have more than one output for a particular input.
Hence, A is not a function of X.

If X is function of A, then input = A and output = X
Input Output
A = 1 X = 500
A = 2 X = 750
A = 3 X = 500
A = 4 X = 1100
A = 5 X = 1200

We have one output for a particular input.
Hence, X is a function of A.

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