Class 8 - Mathematics
Introduction to Graphs - Exercise 15.3
Top Block 1
Question :1. Draw the graphs for the following tables of values, with suitable scales on the axes.
(a) Cost of apples
| No. of apples | 1 | 2 | 3 | 4 | 5 |
| Cost (in 荷) | 5 | 10 | 15 | 20 | 25 |
(b) Distance travelled by a car
| Time (in hours) | 6 a.m. | 7 a.m. | 8 a.m. | 9 a.m. |
| Distance (in km) | 40 | 80 | 120 | 160 |
(i) How much distance did the car cover during the period 7.30 a.m. to 8 a.m?
(ii) What was the time when the car had covered a distance of 100 km since it’s start?
(c) Interest on deposits for a year.
| Deposit(inRs.) | 1000 | 2000 | 3000 | 4000 | 5000 |
| Cost (in Rs.) | 80 | 160 | 240 | 320 | 400 |
(i) Does the graph pass through the origin?
(ii) Use the graph to find the interest on 荷2500 for a year.
(iii) To get an interest of 荷280 per year, how much money should be deposited?
Answer :
(a)
(b) (i) The car covered 20 km distance.
(ii)It was 7.30 am, when it covered 100 km distance.
Mddle block 1
(c) (i) Yes, the graph passes through the origin.
(ii) Interest on 荷2500 is荷200 for a year.
(iii) 荷3500 should be deposited for interest of 荷280.
Question :1. 2. Draw a graph for the following. (i)
| Side of Square | 2 | 3 | 3.5 | 5 | 6 |
| Perimeter(in cm) | 8 | 12 | 14 | 20 | 24 |
Is it a linear graph? (ii)
| Side of Square | 2 | 3 | 4 | 5 | 6 |
| Perimeter(in cm) | 8 | 12 | 14 | 20 | 24 |
Is it a linear graph?
Answer :
(i) Yes, it is a linear graph.
