A relation is a group of number pairs. A function is a relation in which there is exactly one output for every input value. The are similar because they are both relations and they aredifferent by how a function there has to be a input for every output.
Two examples of a function are:(1,2)(3,4)(5,6)(7,8) and (1,3)(2,5)(6,8)(7,9). An example of something that isn’t is:(2,1)(1,2)(3,4)(4,5)
Domain is the set of all input values for a relation. Range is the set of all output values for a relation. For example if you had the numbers(3,4)(5,6)(7,8)(9,10) the domain is 3,5,7,and 9 and the range is 4,6,8, and 10.
Function Notation is the value of f of x. For example:y=-3x+8c(x)=-3x+8
Two ways to show a relation are:-Using a table-Graphing
Two more ways ofshowing a relation are:-Using an equation-Using a set of ordered pairs.