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nevsk [136]
3 years ago
5

If y varies inversely as x and y = –9 when x = –11, find y when x = 66.

Mathematics
2 answers:
Ann [662]3 years ago
8 0

Answer:

y=3 divided by 2

Step-by-step explanation:

zlopas [31]3 years ago
6 0

Answer:

y=\frac{3}{2}

Step-by-step explanation:

y=\frac{k}{x}

-9=\frac{k}{-11}

k=99

y=\frac{99}{66}

y=\frac{3}{2}

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2 years ago
Write the inverse function for the function, ƒ(x) =1/2x + 4. Then, find the value of ƒ^ -1(4). Type your answers in the box.
Kipish [7]

Answer:

f⁻¹(x) = 2x - 8

f⁻¹(4) = 2 × 4 - 8

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Step-by-step explanation:

f(x) = \frac{1}{2} x + 4\\x = \frac{1}{2} f^{-1}(x) + 4\\x - 4 = \frac{1}{2} f^{-1}(x)\\2x - 8 = f^{-1}(x)\\f^{-1}(x) = 2x - 8

Let's test it

f^{-1}(f(x)) = 2(f(x)) - 8\\f^{-1}(f(x)) = 2( \frac{1}{2}x + 4) - 8\\f^{-1}(f(x)) = \frac{2}{2}x + 8 - 8\\f^{-1}(f(x)) = x

So we do indeed have the inverse function, so using that we can plug in the values requested:

f⁻¹(x) = 2x - 8

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f⁻¹(4) = 0

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3 years ago
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