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An equation is a mathematical statement, in symbols, that two things are the same (or equivalent). Equations are written with an equal sign. Equations are often used to state the equality of two expressions containing one or more variables.

Solving an equation means finding a value for the variable that makes the equation true.

In mathematics system of equations are a set of equations containing multiple variables. To solve system of equations, the solver needs to use the provided equations to find the exact value of each variable. Generally the solver uses either a graphical method (by plotting all the lines and/or curves on the same graph and finding the exact coordinates of their intersection), the matrix method, the substitution method, and/or the elimination method. Some textbooks refer to the elimination method as the addition method, since it involves adding equations (or constant multiples of the said equations) to one another.

How many legs in total do a chicken, two ducks,and a sheep have?