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.