solving equations

Here we are now going to solve equations.

1.Solving an equation with one variable:
 solve('equation') will solve the equation(linear or non-linear) for the given variable.
         eg., solve('5*x+x^2=9') gives the answers

                      -5/2+1/2*61^(1/2)
                      -5/2-1/2*61^(1/2)
2.Solving equations with more than one variables
    eg.,simultaneous equations with two variables x,y
      [x,y]=solve('equation_1','equation_2')
                        This solves the two equations(linear or non-linear). two the results of the two variables.If there are more than one solutions for each variable,eg.
x=
       5
       6
y=
       7
       8
           then (5,7) and (6,8) are the two solutions of the equations.

3.Expressing one variable in terms of the other:
solve('equation','subjective variable')

eg. solve('5*x-1=y','x') expresses x in terms of y
   therefore the  solution is:

ans =

1/5+1/5*y
                                                   

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