Question

when x varies directly as 2y and x=4 when y=18,find x when y =36

Answer 1

hello......
The answer is.....

x/y = 4/18, x/36

=》4/18 = x/36

=》4 × 36 = 18 × x

=》x = 4 × 36/ 18

=》x = 8 ans.

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Answer 2

Given :

x varies directly as 2y and x=4 when y=18

To Find :

Find x when y =36

Solution:

We are given that x varies directly as 2y a

So, $x \propto 2y$

Let the proportionality be k

So,x=2ky

We are given x=4 when y=18

So,4=2k(18)

$\frac{4}{2 \times 18}=k\\\frac{1}{9}=k$

Now we are supposed to find x when y is 36

So,$x=2 \times \frac{1}{9} \times 36$

x=8

Hence The value of x is 8 when y = 36