


Description 



Unknown: A variable whose values are solutions of the equation that they are written in. 
For example,
In the equation 3x + 4 = 13, "x" is the unknown. It has the value of x = 3 found by solving the equation for x.
In the system of equations 2x  y = 9 3x + y = 1 the unknowns are "x" and "y" which have the values x = 2 and y = 5 found by solving the system for x and y.


