Create equations in two or more variables to represent relationships between quantities. Graph the equations on coordinate axes using appropriate labels, units, and scales. (Limit to linear; quadratic; exponential with integer exponents; direct and indirect variation.)
Understand that a function from one set (called the domain) to another set (called the range assigns to each element of the domain exactly one element of the range.
Represent a function using function notation and explain that f(x) denotes the output of function f that corresond to the input x .
Understand that the graph of a function labeled as f is the set of all ordered pairs (x,y) that satisfy the equation y = f(x)