Question

1

Answer 1

Real life ex. :Let a car move with speed S km/hr.
Lets say it covers 40 km in 1 hours, 80 km in 2 hours , 160 km in 4hours, etc...
so your data is : (1,40),(2,80),(4,160).....
now you can model this using linear function D=St
where D is the distance covered and t is the time taken.
so we have 40 = 1t, 80=2t, 160 = 4t.....
all these give t=4 hours.
so the function modelled is
D=4S. which is a LINEAR function.
Now, this IS a function, because for every different value of S , we get different value of D.
If for same value of S, we get 2 different values of D, then this would not have been a function.But, D=4S is a function.

Hope this helps :)

Answer 2

welcome :)