Which of the following cannot be rewritten in the form f(x) = ax where "a" is a rational number?

A rational number is a number that can be written as a ratio. That means it can be written as a fraction, in which both the numerator (the number on top) and the denominator (the number on the bottom) are whole numbers. The number 8 is a rational number because it can be written as the fraction 8/1.

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Yes, two vertical lines can be complementary