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Addition of equations

We want to solve two equations with two unknowns. That means, that you determine the intersection point of two straight lines

 


Method 1

Usually the first method you learn is to express x in y in both equations

Now we take the results, and find

Cross multiplication gives

By enteringy in one of the equations you get x.

It's all rather cumbersome, and if you're not careful you can quickly make arithmetical mistakes.

 


Method 2

There is a simpler method to solve the equations. If you work like this, you can save a lot of time.

It is obvious how this works, so no further explanation is needed. You just have to make sure that the x's or the y's disappear.

 


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