What is a Function?

What is a Function?

 

 

 

Example:

 

y = 3x +2  

• is an equation with 2 variables, x and y.
• it can also be considered as a function where x is the input and y is the output.

 

• We use an ordered pair (x, y) to represent sets of input and output that satisfy the equation.
• There are multiples of solution to this equation.
• It is impossible to list out all ordered pair that satisfy the equation. (too many!)
• The best way to represent the solutions to the equation is by drawing a graph that passes through the ordered-pair of the function.
• The graph of a linear equation or linear function is a straight line.
• Every point on the graph satisfies the equation.