SOLUTION: Solve using the addition method. 3x-11y=9, -9x +33y=-27

Question 192095: Solve using the addition method. 3x-11y=9, -9x +33y=-27
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

Start with the given system of equations:

Multiply the both sides of the first equation by 3.

Distribute and multiply.

So we have the new system of equations:

Now add the equations together. You can do this by simply adding the two left sides and the two right sides separately like this:

Group like terms.

Combine like terms. Notice how the x and y terms cancel out.

Simplify.

Since is always true, this means that there are an infinite number of solutions. So the system is consistent and dependent.

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