Whitney D.

In mathematics, an absolute value or modulus is the value of a number without regard to its sign. The absolute value of a real number is also called its magnitude. For example, the absolute value of five is five, but neither –5 nor 5. The absolute value of a number may be thought of as its distance from zero, as a measure of how far it is from zero on a number line. In mathematics, the absolute value (or modulus) of a real number "x" is denoted by |x|. The absolute value of a nonzero real number is greater than or equal to zero. It is also equal to the distance between the number and zero measured in the direction opposite to the negative one. The absolute value of a real number is also called its value, magnitude, or size.

In mathematics, an equation is a statement that two mathematical expressions have the same value. Solving this equation is the process of finding the value of the unknown expression when the other expression is given. An equation is an expression of equality. The unknown appears on the left and the expression on the right of the equals sign. For example, the equation 2x + 3 = 4 has the unknown x and the expression 2x + 3 on the left and the number 4 on the right.

An inequality is a mathematical statement that one quantity is less than or greater than another quantity. If the statement is true for all possible values of the quantities, then the inequality is said to be "satisfiable", "valid" or "truthful"; otherwise it is said to be "unsatisfiable", "invalid" or "false".

In mathematics, a compound inequality is a combination of two or more inequalities involving the same variables. The solution of a compound inequality is the set of all values of the variables that satisfy all of the inequalities.

In mathematics, an inequality is a statement which is either true or false, but not both. In other words, inequalities are truth values. The opposite of an inequality is an equality. In mathematics, inequalities are represented with a less-than or greater-than symbol (?, ?).

In mathematics, a linear equation is an equation in which each term is either a constant or the product of a constant and a single variable. A linear equation is an equation in which the coefficients are constants, and the variables are raised to powers that are single integers.