السؤال 110

A taxi fare is $4 plus$ 2 for each kilometre travelled. Why is total fare not directly proportional to distance?

Because every extra kilometre adds the same $2
Because the fare increases as distance increases
Because a zero-kilometre trip still has a $4 fareالإجابة الصحيحة
Because $4 is exactly twice the per-kilometre charge

الشرح

At zero kilometres the fare is already $4, so the relationship has a nonzero starting value and cannot have the form fare equals a constant times distance. The constant$ 2 per kilometre is tempting evidence, but a constant variable rate does not remove the fixed charge.

الشرح

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