One-dimensional linear equation refers to an equation with only one unknown number, the highest order of which is 1, and both sides are algebraic expressions, which is called one-dimensional linear equation. Finding the value of the unknown quantity in the equation is called the solution of the equation. A one-dimensional linear equation is a linear equation with only one root.

To judge the condition of a linear equation, it must be an equation first, then it must contain unknowns, and the denominator does not contain unknowns.

Application of one-dimensional linear equation

One-dimensional linear equation can solve most engineering problems, travel problems, distribution problems, profit and loss problem, integral table problems, telephone billing problems and digital problems. If only arithmetic is used, some problems may be extremely complicated and difficult to understand. The establishment of linear equation model will be able to find the equivalence relationship from practical problems and abstract it into a mathematical problem that can be solved by linear equations.

For example, it may not be possible to start with algebraic expressions for the Diophantine problem, but finding "age" as an equivalent relationship through a linear equation will simplify the problem.

One-dimensional linear equations can also play a role in proving mathematical theorems, such as proving that "the period of 0.9 is equal to 1" within the scope of elementary mathematics. By verifying the rationality of the solution of linear equation, the purpose of explaining and solving life problems is achieved, and some problems in production and life are solved to some extent.