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siniylev [52]
3 years ago
15

The variables y and x^2 are directly

Mathematics
1 answer:
choli [55]3 years ago
6 0

Answer:

y = \frac{20}{21} x²

Step-by-step explanation:

Given that y and x² are directly proportional then the equation relating them is

y = kx² ← k is the constant of proportion

When x = 2

y = k × 2² = 4k

When x = 5

y = k × 5² = 25k

Then

25k - 4k = 20 ( difference between values is 20 )

21k = 20 ( divide both sides by 21 )

k = \frac{20}{21}

y = \frac{20}{21} x² ← equation of proportion

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Zach read a book for 10 minutes every weekend in the first month, 20 minutes in the second month, 40 minutes in the third month,
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4 years ago
Read 2 more answers
A $230 pair of shoes is on sale for 20% off at a store in Illinois. Sales Tax in Illinois is 11.5%. How Much Will The shoes end
Zepler [3.9K]
FIND SALE PRICE
= $230 - ($230*20%)
= $230 - $46
= $184

OR

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= $230 * 80%
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*use the method you're most comfortable with or that your teachers prefer

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ANSWER: The shoes with discount and taxes cost $205.16.

Hope this helps! :)
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