Question

The variables y and x have a proportional relationship, and y = 5 when x = 4.

What is the value of x when y = 8?



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x =

Answer 1

Answer:

Answer

Find out the what is the value of x when y = 8 .

To prove

As given

The variables y and x have a proportional relationship.

y \propto xy∝x

y = kx

Where k is the constant of proportionality.

As y = 5 when x = 4

Put in the above

5 = 4k

k = \frac{5}{4}k=

4

5

Now find out the value of x , when y = 8

8 = \frac{5\times x}{4}8=

4

5×x

x = \frac{8\times 4}{5}x=

5

8×4

x= 6.5

Therefore when y = 8 than x = 6.4

Step-by-step explanation:

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Answer 2

Answer:

Assuming that they are in direct proportion

Step-by-step explanation:

If two things are in proportion, their ratio is same

So if, x/y = 4/5

Then x/y when y=8 should also be 4/5

This can happen when x=6.5

x/y = 6.5/8 = 4/5