EXERCISE 7
In the following tables, the two variables x and y are inversely proportional. In each case:
(i)
Find the values of a and b.
(ii)
(a)
(b)
(c)
(1)
Draw a graph of y versus x, using an appropriate scale.
(Use the same scale on both axes.)
(1)
(2)
x
y
6
4
0,4
2,5
8
a
b
12
4
b
(2)
(4)
y
x
y
6
5
What would the current be when the resistance is 292?
Draw the graph of current versus resistance.
1
4
5
a
(3)
X
0,2
y
a
Use the concept of indirect proportion to answer the following questions:
(1)
Two mothers each buy the same pack of sweets. The one mother has 3 children and
can give each child 12 sweets. How many sweets can the other mother give to each
child if she has 6 children?
(2)
If 6 men can diğ a ditch in 2 hours. How many men would be required to dig the ditch
in 3 hours?
(3)
If you travel at 100 km/h a journey takes 40 minutes. How long does the same journey
take if you travel at 80 km/h?
The current (in A for ampere) flowing through a resistor is inversely proportional to the
resistance (in 92 for ohm) of the resistor if connected to a constant voltage source. When the
resistance is 592, the current is 6 A.
4
a
b
10
b
2