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# Jamb Video: Direct Inverse Joint And Partial Variation

In this topic am going to show you in this Jamb video about Variation | Partial Variation | joint variation and Direct Inverse, so that yo can be able to handle it in jamb examination.

Variati0n Under Jamb Mathematics: Candidates should be able to:
i. solve problems involving direct, inverse, joint and partial variations;
ii. solve problems on percentage increase and decrease in variations.

A variable is simply a quantity that may change in value. A variable might be the the air temperature each day, or the exam marks given to a class of school children. Watch the Video and tell me how you feel.

Joint Variation is where more than two variables are related directly. Partial Variation, where two variables are related by a formula, such as the formula for a straight line (with a non-zero y-intercept).

## Highlights From The Video

1. In Mathematics, we usually deal with two types of quantities-Variable quantities (or variables) and Constant quantities (or constants).

2. Constants are quantities whose values do not change.

3. In a variati0n if variables change proportionately it is called direct variati0n.

4. For inverse variati0n, the increase in one quantity results to decrease in the other.

5. Two variable quantities are proportional if one is always obtainable from the other by multiplying by a constant value.