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Besides equations, there are [[inequality|inequalities]] (''less than'' and ''greater than''). A special type of equation is called the function. This is often used in making [[graph]]s because it always turns one input into one output. | Besides equations, there are [[inequality|inequalities]] (''less than'' and ''greater than''). A special type of equation is called the function. This is often used in making [[graph]]s because it always turns one input into one output. | ||
Algebra can be used to solve real problems because the rules of algebra work in real life and numbers can be used to represent the values of real things. [[Physics]], [[engineering]] and [[computer programming]] are areas that use algebra all the time. It is also useful to know in [[surveying]], [[construction]] and [[business]], especially [[accounting]]. | Algebra can be used to solve real problems because the rules of algebra work in real life and numbers can be used to represent the values of real things. [[Physics]], [[engineering]] and [[computer programming]] are areas that use algebra all the time. It is also useful to know in [[surveying]], [[construction]] and [[business]], especially [[accounting]]. | ||
People who do algebra use the rules of [[number]]s and mathematic [[operation (mathematics)|operations]] used on numbers. The simplest are [[addition|adding]], [[subtraction|subtracting]], [[multiplication|multiplying]], and [[division (mathematics)|dividing]]. More advanced operations involve [[exponent]]s, starting with [[square (algebra)|squares]] and [[square root]]s. | People who do algebra use the rules of [[number]]s and mathematic [[operation (mathematics)|operations]] used on numbers. The simplest are [[addition|adding]], [[subtraction|subtracting]], [[multiplication|multiplying]], and [[division (mathematics)|dividing]]. More advanced operations involve [[exponent]]s, starting with [[square (algebra)|squares]] and [[square root]]s. | ||
Algebra was first used to solve [[algebraic equation|equations]] and inequalities. Two examples are [[linear equation]]s (the equation of a straight line, <tt>y=mx+b</tt> <big>or</big> <code>y=mx+c</code>) and [[quadratic equation]]s, which has variables that are [[Square (algebra)|squared]] (multiplied by itself, for example: <tt>2*2, 3*3, or x*x</tt>). | Algebra was first used to solve [[algebraic equation|equations]] and inequalities. Two examples are [[linear equation]]s (the equation of a straight line, <tt>y=mx+b</tt> <big>or</big> <code>y=mx+c</code>) and [[quadratic equation]]s, which has variables that are [[Square (algebra)|squared]] (multiplied by itself, for example: <tt>2*2, 3*3, or x*x</tt>). | ||
== History == | == History == | ||