ABSTRACT
This chapter solves simultaneous equations in two unknowns by substitution, simultaneous equations in two unknowns by elimination and simultaneous equations involving practical situations. However, when an equation contains two unknown quantities it has an infinite number of solutions. When two equations are available connecting the same two unknown values then a unique solution is possible. Similarly, for three unknown quantities it is necessary to have three equations in order to solve for a particular value of each of the unknown quantities and so on. Equations that have to be solved together to find the unique values of the unknown quantities, which are true for each of the equations, are called simultaneous equations.
