Question

The following table gives the quantity of petrol and its cost

Quantity of petrol	1	2	3	4	5	6	7
Cost of petrol	70	140	210	280	350	420	490

Plot the graph.

Answer 1

1. Take a suitable scale on both the axes. Here we take on the x – axis
   1 cm = 1 litre, on the y axis 1 cm = 70 rupees.
2. Mark number of litres of petrol along the x – axis
3. Mark the cost of petrol along the y – axis.
4. Plot the points (1, 70), (2, 140), (3, 210), (4, 280), (5, 350), (6, 420) and (7,490)
5. Join the points.

The graph can help us to estimate few more things also.