SOLUTION: How do you solve a 3x3 system of equations when the variables don't cancel out? For example, let's say your equations are 5x+7y=2 and 2x+9y=3. Can you multiply the first equation b

Question 992040: How do you solve a 3x3 system of equations when the variables don't cancel out? For example, let's say your equations are 5x+7y=2 and 2x+9y=3. Can you multiply the first equation by 9 and the second equation by -7?
Answer by ikleyn(52778) (Show Source): You can put this solution on YOUR website!
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If you want to exclude x, you may multiply the first equation by 2 (both sides) and the second equation by (-5) and then add them.

If you want to exclude y, you may multiply the first equation by 9 (both sides) and the second equation by (-7) and then add them.

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