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3. a statement comparing two quantities that are not equal
4. a combination of numbers, variables, and mathematical operations
6. something related to none straight lines.
11. a symbol, typically a letter, used to represent a number that can change or vary in value
12. there is no value for the variable(s) that can be substituted into an equation or system of equations to make the equation(s) true
15. In mathematics, the irrational numbers are all the real numbers that are not rational numbers. That is, irrational numbers cannot be expressed as the ratio ...

1. a statement that two expressions are equal, connected by an equals sign
2. describes its steepness and direction
5. one of the axes of a two- or three-dimensional graph
7. there is only one value for the variable that makes the equation true
8. represents a part of a whole and is typically written as numerator/denominator
9. A rational number is a real number. The real numbers that are rational are those whose decimal expansion either terminates after a finite number of digits.
10. one number that gives another specific number.
13. the vertical axis in a Cartesian coordinate system, also known as the axis of ordinates
14. something related to straight lines.