Page 237 - Maths Skills - 8
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Answers                                                                                                235


         HOTS


          1. Do it yourself.   2.   9           3.   1   (Hint: Ordinary year has 365 days)   4. (i)   7  (ii)  23
                                11                7                                    90             90

         Chapter - 13: Introduction to Graphs
         Boot-up

         A.  1. (i)           2. (iii)          3.  (iii)        4. (iv)        B. 1. infinite      2. parallel
            3. 0              4. Same          C.  1. True       2. True          3. True
         Exercise - 13.1

          1.  (i)  IV     (ii) IV     (iii) I    (iv) III    (v) II   2. Do yourself
          3.  (i)  I      (ii) I      (iii) I    (iv) II    (v) IV    (vi) III
          4.  (i)                                                   (ii)                Y
                                  Y                                                   6
                                 6                                                    5     Parallelogram
                                 5  B    C                                            4
                                 4                                                    3  J      M
                                 3         Rectangle                                  2
                                 2                                                    1            K      L
                                 1        D                                                                 X
                                   A                                    –6 –5 –4 –3 –2 –1  0  1      2  3     4  5  6      7  8
                   –6 –5 –4 –3 –2 –1  0  1      2  3     4  5  6  X                  –1
                                –1                                                   –2
                                –2                                                   –3
                                –3                                                   –4
                                –4                                                   –5
                                –5                                                   –6
                                –6


             (iii)              Y                              5. (i) L: (– 4, – 3)      (ii) S: (2, 2)     (iii)  A: (– 4, – 2)
                              5
                                                                        (iv)  R: (1, – 4)                 (v)  M: (– 2, 6)
                              4
                                     Triangle
                              3                                6.                  Y
                                                                                 6
                              2
                                  W     Z  Y                                     5
                              1                                                  4
                                       X          X
                               0                                                 3
                 –5 –4  –3 –2 –1  1       2  3       4  5  6
                             –1                                                  2
                             –2                                                  1
                                                                                                       X
                             –3                                    –6 –5 –4 –3 –2 –1  0  1       2  3     4  5  6     7  8
                             –4                                                 –1
                                                                                –2
                             –5                                                 –3
                                                                                –4
                                                                                –5
                                                                                –6
         Exercise - 13.2

            Do it yourself.
         Exercise - 13.3

          1. (i) 4th week    (ii) 1st and 2nd week   (iii)  2 cm  2. (i) Plot the graph taking suitable scale
            (ii)  Between 11:10 a.m. to 11:20 a.m. and 10:40 a.m. to 10:50 a.m.   (iii) 16.66 m/s   (iv) 38 km/hr  or 10.5 m/s
          3. (i) Distance travelled between C to E = 15 km  (ii)  2 m/s   (iii) The speed of the car is zero between 0 to 20 seconds
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