There are four kinds of relations in ordered pairs:
one to one (each x value is unique and has a unique y value associated with it)
one to many (each x value has multiple possible y values)
many to one (each y value has multiple possible x values)
many to many (x and y values can be repeated and are not unique)
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the three kinds of variables are independent,dependent and controlled
The decimal point seperates whole numbers from fraction of a whole number
Pythagorean Theorem is one.
shapes and masurements
The same as in any other math class. All functions are relations but all relations are not functions. A function must have only one 'answer' in the range for each value of the domain. Relations are just pairing of numbers with no such restriction on the range.