Question

Number of articles X and their price Y vary _____________.​

Answer 1

Given :  Number of articles X and their price Y

To Find :  Direct or indirect variation

Solution:

Number of articles X and their price Y   has direct relation

Directly proportional

As if we have have to but more articles then we need to more price.

If Spend more then we can but more articles

Y = kX

where k is constant and price (rate ) of one article

Let say rate of article is Rs 100

X              Y

0                0

1               100

2              200

3               300

9             900

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