Coordinate Planes
 The coordinate plane is a twodimension surface formed by two number lines. One number line is horizontal and is called the xaxis. The other number line is vertical number line and is called the yaxis. The two axes meet at a point called the origin. We can use the coordinate plane to graph points, lines, and more.


Integers
 Integers are positive and negative WHOLE NUMBERS including zero.


Rational Numbers
 a rational number is any number that can be expressed as the quotient or fraction p/q of two integers, a numerator p and a nonzero denominator q. Since q may be equal to 1, every integer is a rational number. ... A real number that is not rational is called irrational.




Absolute Value
 The distance a number is from zero.
 Examples: I 5 I= 5 because 5 is 5 units away from Zero. I 4 I = 4 because 4 is 4 units from zero.


Inequalities

