Question

if x varies directly as y and x=7, when y=28,, find x,, when y is 84

Answer 1

x become 21

am I right then follow me

Answer 2

The value of x is 21 .

Step-by-step explanation:

We are given that x varies directly as y

$x \propto y$

$x=ky$ --- A

We are given that x = 7 and y = 28

Substitute the values in A

7 = 28k

$\frac{7}{28}=k$

$\frac{1}{4}=k$

Now equations becomes : $x = \frac{1}{4}y$

y = 84

$x = \frac{1}{4}(84)\\x= 21$

Hence The value of x is 21 .

#Learn more:

Find the value of y for a given value of x, if y varies directly with x.

If y = −252 when x = 84, what is y when x = 74

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