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5x = 10 - 20 gives 5x = -10 so that x = -10/5 = -2.


Substitute this value in the second equation:

-5*-2 + y = 9

that is 10 + y = 9

so that y = -1


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11y ago
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Q: What method to use on this equation 5x plus 10-20 and-5x plus y equals 9?
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