Relation and function

Which of the following relations are functions ? yltx+3 .

Which of the following relations are functions ? y=3x+2.

Which of the following relations are functions ? y is a Maths pupil of x, where x represents any Maths teacher in a school.

Which of the following relation are functions? Give reasons. If it is a function, determine its domain and range. {(a,b),(b,c),(c,d),(d,e)}

Which of the following relation are functions? Give reasons. In cane of a function, determine its domain and range. {(1,-2),(3,7),(4,-6),(8,11)}

Which of the following relation are functions? Give reasons. In cane of a function, determine its domain and range. {(1,0),(1,-1),(2,3),(4,10)}

Which of the following relations are functions ? y is the Maths teacher of x where x represents any pupll taking up Maths in a school.

A certain jet plane has an average speed of 500 km per hour. It can carry sufficient fuel for a 5 hour flight. Is this relation a function?

A function f given as f:{(2,7),(3,4),(7,9),(-1,6),(0,2),(5,3)} . Is this function one-one onto? Interchange the order of the elements in the ordered pairs and form the new relation. Is this relation a function? If it is a function, is it one-one onto.

Let N be the set of natural numbers and the relation R be defined on N such that R = {(x , y) : y = 2x , x , y in N} .What is the domain, codomain and range of R? Is this relation a function?