# NCERT Solutions for Class 8 Maths

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# Introduction to Graphs

Exercise 1

1.    The following graph shows the temperature of a patient in a hospital, recorded every hour:

(a) What was the patient’s temperature at 1 p.m.?

(b) When was the patient’s temperature 38.5° C?

(c) The patient’s temperature was the same two times during the period given. What were these two times?

(d) What was the temperature at 1.30 p.m.? How did you arrive at your answer?

(e) During which periods did the patients’ temperature showed an upward trend?

2.    The following line graph shows the yearly sales figures for a manufacturing company.

(a) What were the sales in (i) 2002 (ii) 2006?

(b) What were the sales in (i) 2003 (ii) 2005?

(c) Compute the difference between the sales in 2002 and 2006.

(d) In which year was there the greatest difference between the sales as compared to its previous year?

3.   For an experiment in Botany, two different plants, plant A and plant B were grown under similar laboratory conditions. Their heights were measured at the end of each week for 3 weeks. The results are shown by the following graph.

(a) How high was Plant A after (i) 2 weeks (ii) 3 weeks?

(b) How high was Plant B after (i) 2 weeks (ii) 3 weeks?

(c) How much did Plant A grow during the 3rd week?

(d) How much did Plant B grow from the end of the 2nd week to the end of the 3rd week?

(e) During which week did Plant A grow most?

(f) During which week did Plant B grow least?

(g) Were the two plants of the same height during any week shown here? Specify.

4.    The following graph shows the temperature forecast and the actual temperature for each day of a week.

(a) On which days was the forecast temperature the same as the actual temperature?

(b) What was the maximum forecast temperature during the week?

(c) What was the minimum actual temperature during the week?

(d) On which day did the actual temperature differ the most from the forecast temperature?

5.    Use the tables below to draw linear graphs.

(a) The number of days a hill side city received snow in different years.

Year       2003       2004       2005       2006

Days          8              10           5              12

(b) Population (in thousands) of men and women in a village in different years.

Year                       2003       2004     2005       2006       2007

No. of Men           12             12.5        13           13.2        13.5

No. of Women   11.3           11.9        13           13.6        12.8

6.    A courier-person cycles from a town to a neighbouring suburban area to deliver a parcel to a merchant. His distance from the town at different times is shown by the following graph.

(a) What is the scale taken for the time axis?

(b) How much time did the person take for the travel?

(c) How far is the place of the merchant from the town?

(d) Did the person stop on his way? Explain.

(e) During which period did he ride fastest?

7.    Can there be a time-temperature graph as follows? Justify your answer.

Exercise 2

8.   Plot the following points on a graph sheet. Verify if they lie on a line

(a) A(4, 0), B(4, 2), C(4, 6), D(4, 2.5)

(b) P(1, 1), Q(2, 2), R(3, 3), S(4, 4)

(c) K(2, 3), L(5, 3), M(5, 5), N(2, 5)

9.   Draw the line passing through (2, 3) and (3, 2). Find the coordinates of the points at which this line meets the x-axis and y-axis.

10.  Write the coordinates of the vertices of each of these adjoining figures.

11.  State whether True or False. Correct that are false.

(i) A point whose x coordinate is zero and y-coordinate is non-zero will lie on the y-axis.

(ii) A point whose y coordinate is zero and x-coordinate is 5 will lie on y-axis.

(iii) The coordinates of the origin are (0, 0).

12.  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 Rs.)        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 over 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 (in Rs.)                  1000       2000       3000       4000       5000

Simple Interest (in Rs.)   80           160         240         320         400

(i) Does the graph pass through the origin?

(ii) Use the graph to find the interest on Rs. 2500 for a year.

(iii) To get an interest of Rs. 280 per year, how much money should be deposited?

13.  Draw a graph for the following.

(i) Side of Square (in cm)    2              3              3.5          5              6

Perimeter (in cm)             8              12           14           20           24

(ii) Side of Square (in cm)    2              3              4              5              6

Area (in cm2)                     4              9              16           25           36

Is it a linear graph?

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