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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
2.11 Direct Proportion - II

Example:
x is directly proportional to y, if x=3 and y=2, find the constant of variation and then find x when y = 6?

Solution:
x y x = ky
Given that x= 3, y = 2
3 =2k
\ k = 3/2
Constant of variation is 3/2
No, find x when y = 6.
y = 6 x = (3/2) * 6
x = 3 * 3
x = 9


Directions: Solve the following problems. Also write at least 10 examples of your own.
Q 1: x is directly proportional to y, if x=5 and y=7, find the constant of variation and then find x when y = 5.
25/7
7/25
7
25

Q 2: x is directly proportional to y, if x=7 and y=5, find the constant of variation and then find y when x = 10.
50/7
50
7
7/50

Q 3: x is directly proportional to y, if x=12 and y=13, find the constant of variation and then find x when y = 5.
60/13
13
13/60
60

Q 4: x is directly proportional to y, if x=9 and y=6, find the constant of variation and then find y when x = 3.
5
26
26/5
2

Q 5: x is directly proportional to y, if x= and y=4, find the constant of variation and then find x when y = 8.
None of these
8
3/5
4

Q 6: x is directly proportional to y, if x=2 and y=3, find the constant of variation and then find x when y = 4.
8
3
8/3
3/8

Q 7: x is directly proportional to y, if x=3 and y=4, find the constant of variation and then find x when y = 7.
21/4
21
4
4/21

Q 8: x is directly proportional to y, if x=7 and y=6, find the constant of variation and then find y when x = 7.
7
7/6
6
6/7

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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