1. VARIATION
Std : 7
Subject : Maths
Chennai High School –MMDA II

2. Variation
Direct Inverse
Variation Variation

3. Direct Variation
 If an increase(↑) [decrease(↓)] in one quantity
produces a proportionate increase(↑)
[decrease(↓)] in another quantity, then the
two quantities are said to be in direct
variation.

4. Direct Variation
You buy more Costs you
pens? more

5. Inverse Variation
 If an increase(↑) [decrease(↓)] in one quantity
produces a proportionate [decrease(↓)]
increase(↑) in another quantity, then the two
quantities are said to be in direct variation.

6. Inverse Variation
Cutting down of Increase in
trees temperature