1. Which relation represents a function?
   
   

a] x = 1, 1, 1, 1, 1

y = 2, 3, 4, 5, 6


b] x = 1, 2, 3, 4, 5

y = 5, 4, 3, 2, 1


c] x = 1, 2, 1, 2, 1

y = 0, 1, 2, 3, 4


d] x = -2, -1, 0, -1, -2

y = 2, 3, 4, 5, 6

1. The function f(x) varies directly with x and f(x) = 2 where x= 10
   
   

what is the value of f(x) if x= 40


a] 320

b] 45

c] 200

d] 8