RELATIONS AND FUNCTIONS
Chapter 1
FORMULAE TO REMEMBER
Vertical line test :
A curve drawn in a graph represents a functions, if every vertical line intersects the curve in
most one point.
Horizontal line test:
A function represented in a graph is one-one, if every horizontal line intersect the curve in a most one point.
Linear functions has applications in Cryptography as well as in several branches of Science and
Technology.
