New Learning Composite Mathematics SK Gupta Anubhuti Gangal Class 8 Line Graphs Self Practice 15B Solution
(2)
(a) y = x + 5
X | 0 | 4 | 7 | * |
y | 5 | 9 | 12 | * |
(b) y = 2x
X | 1 | 3 | 6 |
y | 2 | 6 | 12 |
(c) y = 2x – 3
X | 0 | 3 | 4 | 5 |
y | -3 | 3 | 5 | 7 |
(d) y = x – 5
X | 5 | 8 | 9 | 11 |
y | 0 | 3 | 4 | 6 |
(3)
(a) Y = 5X
X | 1 | 2 | 3 |
y | 5 | 10 | 15 |
(b)
(i) X = 5
∴ Y = 5X =5 x 5 = 25
∴ Locate by going 5 positive units along the X axis & 25 positive units along the Y axis.
(ii) X = 6
∴ Y = 5X = 5 x 6 = 30
∴ Locate by going 6 positive units along the X axis & positive units along the Y axis.
(4)
x |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
y | 1.6 | 3.2 | 4.8 | 6.4 | 8 | 9.6 | 11.2 |
12.8 |
Here x is represents to mile.
Y is represents to km.
(a) 1 miles = 1.6 km
4.5 miles = (1.6 x 4.5) km
= 7.2 km
(b) 1.6 km = 1 miles
1 km = 1/ 1.6 miles
8 km = 1/ 1.6 x 8 miles
= 5 miles.
(5)
(b) Approximately 9.20 am
* Increasing
(c) 2 hours
(d) At 4 pm temperature will be -> 38.5^{o}c
At 4 pm temperature will be -> 35^{o}c
Tem fall = 38.5 – 35.0
= 3.5^{o}c
(7)
(a) 2 cars
(b) (15 + 8 +10) = 33 cars are sold
(c) Sep & Oct
(8)
(a)
(i) Smiliti’s temperature at p.m. Saturday was 38.8^{o}c
(ii) Smiti’s temperature at 8 am Sunady was 38.6^{o} c
(iii) Smiti’s temperature at midnight Sunday 37.8^{o} c
(iv) Smiti’s temperature at 12 h after midnight Sunday was 37.2^{o}c
(b) The change in her temperature from 4 pm on Sunday to 4 am on Monday down 0 – 2^{o} c
(c) Around noon Sunday, because of the sharp decrease in her temperature.
(9)
(a)
(i) Y -> 2500 (deposit)
X -> 160 + 240 / 2
= 400/2
= 200
S.I. = 200
(b) Yes, It is linear graph
(10)
(a) r = 42
C = 2πr
= 2 x 22/7 x 42
= 264
r | 7 | 14 | 21 | 28 | 35 | 42 |
c | 44 | 88 | 132 | 176 | 220 | 264 |
(b) When,
C = 220 unit
∴ R = 35 Unit