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Solving Linear Equations with Python


Solving linear equations is a fundamental mathematical operation that Python makes simple. ax + by = c, where a, b, and c are constants, is how linear equations, or those with the highest power of 1, are represented. When solving a linear equation, the main objective is to determine the values of the variables (like x and y) that cause the equation to be true by comparing the left to the right. The two basic ways for doing this are analytical ones like substitution and reduction and numerical ones that depend on matrix-based algorithms. By utilizing modules like NumPy and SymPy, you can easily solve linear equations in Python.

Using NumPy

  • The popular Python package NumPy is used for many numerical operations, including solving linear equations.
  • Linear equations are frequently represented in NumPy as (Ax = b), where A stands for the coefficient matrix, x is the parameter vector, and b stands for the right-side vector.
  • To locate the solution vector x quickly, use np.linalg.solve.


Solution for x: [1. 2.]

Using SymPy

  • A Python library for conceptual mathematics is called SymPy. Both numerical computations and symbolic expressions are compatible with it.
  • You use symbolic variables & equations while using SymPy to solve linear equations.
  • You can locate symbolic answers to systems of linear equations using SymPy's sp.solve function.


Solution: {x: 1, y: 2}

Example for 3 variables

Using NumPy


Solution for x, y, z: [2. 3. 4.]

Using SymPy


{x: 2, y: 3, z: 4}



  • Linear equations are useful for describing how moving things move because they make calculating variables like position, speed, and acceleration possible.
  • Electrical engineers use linear equations to analyze and solve circuits that contain resistors, capacitors, and inductors.


  • Linear equations are used in structural analysis to examine deformations and stresses in bridges and buildings.
  • Engineers create and analyze control systems using linear equations for processes in sectors like manufacturing and aerospace.


  • Economists can better understand how markets function by modelling the demand and supply curves using linear equations.
  • Economic cost functions, essential for companies to optimise production, are modelled using linear equations.


  • Loan, investment, and mortgage interest are all calculated using linear equations.
  • Investors optimize their portfolios based on risk and return using linear equations.

Statistics and data science

  • A popular statistical technique for simulating relationships between variables in data, linear regression is based on linear equations.
  • Linear equations can be used to examine market trends and consumer preferences.


  • To balance chemical equations and guarantee that the quantity of atoms on both sides is equal, linear equations are utilized.

Environmental Science

  • To simulate the dispersion of contaminants in the atmosphere and forecast their effects, linear equations are utilized.


  • In fields like telecommunications & audio processing, linear equations are employed for signal processing.


Linear equations are useful in various real-world applications because of their versatility and wide applicability. We may use linear equations to design effective structures, characterise physical systems' behaviour, and spot economy trends. They are the foundation for statistical tools like linear regression and are crucial in computer graphics and robotics. Linear equations allow us to make well-informed judgements and resolve challenging issues, whether forecasting market demand, controlling traffic flow, or optimising drug dosage in medicine. As a result, they act as a cornerstone of contemporary science and technology, highlighting the pervasive importance of this essential mathematical idea in our day-to-day activities.

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