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exis [7]
3 years ago
15

If y varies directly with x when y=1/3 and x = 12, find x if y is 4.

Mathematics
1 answer:
Nikitich [7]3 years ago
6 0

Answer:

x = 144

Step-by-step explanation:

y α x

we introduce a constant 'k' when changing from α to =.

i.e y = kx

y = ⅓ when x = 12

Meaning, ⅓ = k * 12

⅓ = 12k

k = ⅓ ÷ 12

k = 1/36

If y = 4, x = ?

using the equation y = kx

4 = (1/36)x

x = 4 ÷ (1/36)

x = 4 * 36

x = 144

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Answer:

Step-by-step explanation:

8x+47=8(x+5)

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2 years ago
20=8+3(12+4x) Please help<br> It's really hard
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So first, you have to remember the order of operations. That means that whatever is in the parentheses is what has to be done first
However, because one of the numbers in the parentheses is a variable and the other isn't, we can distribute instead
Therefore, 3(12+4x) distributes by multiplying the 3 into both numbers in the parentheses. So we get 36+12x
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Now simplify

20-8-36=12x
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Hope this helped!!! :D
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3 years ago
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