Mark (✓) against the correct answer:

Question:

Mark (✓) against the correct answer:

x and y vary inversely. When x = 15, then y = 6. What will be the value of y when x = 9?

(a) 10

(b) 15

(c) 54

(d) 135

Solution:

(a) 10

Since $x$ and $y \operatorname{var} y$ inversely, $x y=$ constant.

Now, $15 \times 6=9 \times y_{1}$

$\Rightarrow \frac{90}{9}=y_{1}$

$\Rightarrow 10=y_{1}$

∴ Value of y = 10, when x = 9.

 

 

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