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Question

a) I buy milk of different quantities at the rate of Rs.30 per litre. Which graph do I use to represent the data if I plot quantity of milk purchased on one axis and total cost of purchase on another axis.

b) What is a linear graph?  [3 MARKS]


Solution

Concept: 1 Mark
Application: 1 Mark
Definition: 1 Mark

a) I use a linear graph. As I purchase more milk, the money I spend on milk keeps increasing accordingly. Hence the money spent on milk varies linearly with quantity of milk purchased.

b) 
If we plot points on a graph and on joining the plotted points we get a straight line. This graph is known as a linear graph.

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