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Ivan
3 years ago
8

If y varies directly with x when y=8,x=20 find the value of x when y=42

Mathematics
1 answer:
Alecsey [184]3 years ago
5 0

The value of x is 105 when y=42

Step-by-step explanation:

A direct proportion means that the change in one quantity will also cause the change in other quantity

Given

y varies directly with x

x ∝ y

when the proportionality symbol is removed a proportionality constant is introduced

x=ky\\k=\frac{x}{y}\\Putting\ y=8\ and\ x=20\\k=\frac{20}{8}\\k = \frac{5}{2}\\So,\ the\ equation\ will\ be\\x=\frac{5}{2}y\\Putting\ y=42\\x=\frac{5}{2}*42\\x=5*21\\x= 105

The value of x is 105 when y=42

Keywords: Proportion, Direct variation

Learn more about proportion at:

  • brainly.com/question/3398261
  • brainly.com/question/3614284

#LearnwithBrainly

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The diagram for the given garden is given below.

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The area of the garden = Area of rectangle + Area of triangle

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Hence, the area of the garden is 72 feet² and the perimeter of the garden is 36 feet.

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In this case we need to test whether young men nationwide have a mean score below 275 in the National Assessment of Educational Progress math assessment.

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