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You have solved linear equation with one variable. Now it’s  time to learn how to solve the equation with two variables.

Consider the equations below:

x + 2y + 4 = 0   ,    3x + 4y = 18   ,      5u – 6v = 11 

Here you see that there are two variable, i.e. x and y , whose values are unknown. In earlier post I have given one equation, i.e. ax – b = 0 , similarly here is one equation ax + by + c = 0 where a ≠ 0 , b ≠ 0. 

Now we will learn how to solve these equation given above:

Let us take this equation  3x + 4y = 18 , to solve this equation you have to use trial and error method. When you do trial and error you get x = 2 and  y = 3 . If you do more trial and error method you get many solutions of this, one is that I have give first and another is x = 6 and y = 0 . This shows that linear equations in two variable can have infinite number of solutions. 


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