Åk 6–9
  • Start
  • 1. Welcome to Equations
  • 2. Solving Simple Equations
  • 3. Methods to Solve Equations
  • 4. Problem Solving with Equations
  • 5. Systems of Equations
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    English/Soomaali
    1.1 Introduction
    When you look in a dictionary, you can find different definitions about equations. In order to explain in the easiest possible way, you can say that an equation:
    • is an equality between two mathematical expression, which are called the left hand side and the right hand side.
    • Contains one or several unknowns.  If it contains an unknown, we usually use the letter x.
    Example:

    5x + 2 = 18

    The letter x is an unknown and 5x + 2 is equal to 18, it is an equality.


    Formula and Equations
    Many scientific and technical formulas can be expressed as equations.  One example is when calcultating the volume for a sphere (a ball is a sphere).
    Foto: Specialpedagogiska institutet, Multimediabyrån



    One of the most well known equation is Einstein’s
    E = mc2 where he describes energy with mass.
    Bild: Torben Freytag



    We will go through more about formulas in the section Formulas and Functions.