Direct Variation with x and y

This animation explains direct variation using the example y varies directly as x, with y=10 when x=5. It visually demonstrates how to form the equation y=kx by finding the constant of proportionality, then applies it to calculate y when x=20 and x when y=50. The step-by-step approach suits GCSE, IGCSE, and O Level students learning to set up and solve variation problems confidently.

Narrated · 16:9 · Preview before teaching · automatic layout checks do not establish subject accuracy

The prompt that made it

Explain concept of direct variation by using an example. Example: y varies directly as x. y=10 when x=5. a) Write an expression connecting x and y. b) Find the value of y when x=20 c) Find the value of x when y=50. Audience: O Level, IGCSE, GCSE, EDEXCEL students

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• Explain inverse variation with an example where y varies inversely as x
• Show how to solve joint variation problems involving three variables
• Compare direct variation graphs to linear equations with non-zero intercepts