DOMAIN: Find the domain of the function. In the space provided, type the answer without any spaces between the letters, numbers, or symbols.

Let x and y be directly related. If x is 18 when y is 6, find when x is 21


1 Resposta

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Hi Lucy S.,

For x and y to be directly related, y is equal to a constant times x, y = k*x, or y/x = k. We can find the constant k with what we've been given. Then we can solve for when x = 21.

y/x = k

6/18 = k

1/3 = k

So we can write this a y/x = 1/3 or y = x/3. And when x = 21:

y = x/3

y = 21/3

y = 7, for x = 21.

The domain is (-∞, ∞).

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