HSC Together Year 11 Maths Standard: Direct Variation

#### Maths Standard

• Earning and Managing Money
• Formulae and Equations
• Measurement and Energy
• Relative Frequency and Probability
• Perimeter, Area and Volume
• Classifying and Representing Data
• Linear Relationships
• Interest and Depreciation
• Exploring and Describing Data
• Working with Time
• Budgeting and Household Expenses
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Back to other subjects

# Direct Variation

### What is direct variation?

Direct variation occurs when one variable depends directly on another variable. As one increases, the other must increase at the same rate. A common example is how much you earn per week is directly proportional to the hours you worked. The steps below show you how to solve a direct variation problem in Prelim Standard Math:

1. Write an equation relating the two variables together (k is the constant. If y is directly proportional to x then the equation is y=kx)
2. Solve the equation for k by substituting the x and y values
3. Write the equation with the solution for k and solve the problem by substituting to find the final answer desired

### How to solve direct variation questions

The videos below explain the concept of direct variation and solve real-life problems using the equation.

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