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]

Answer 1

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.