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Find Constant of Variation and Write Equation of Variation for Every Example Given Below. X ∝ 1 √ Y ; If X = 15 Then Y = 9 - SSC (English Medium) Class 8 - Mathematics

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Question

Find constant of variation and write equation of variation for every example given below.

x ∝ \[\frac{1}{\sqrt{y}}\] ; if x = 15 then y = 9

Solution

\[x \propto \frac{1}{\sqrt{y}}\]

\[\therefore   x = \frac{k}{\sqrt{y}}\] , where k is constant of variation

When x = 15, y = 9.

\[\therefore   15 = \frac{k}{\sqrt{9}}\] 

\[ \Rightarrow 15 = \frac{k}{3}\] 

\[ \Rightarrow k = 15 \times 3 = 45\]

So, the equation of variation is \[x = \frac{45}{\sqrt{y}}\] or \[x\sqrt{y} = 45\] .

  Is there an error in this question or solution?

APPEARS IN

 Balbharati Solution for Balbharati Class 8 Mathematics (2019 to Current)
Chapter 7: Variation
Practice Set 7.2 | Q: 2.4 | Page no. 38
Solution Find Constant of Variation and Write Equation of Variation for Every Example Given Below. X ∝ 1 √ Y ; If X = 15 Then Y = 9 Concept: Inverse Variation.
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