Question

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Resolva o sistema

2x + 3y = 30
2x-y = 6

Answer 1

2x + 3y = 30
2x - y = 6 . (-1)
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2x + 3y = 30
-2x + y = -6
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4y = 24
y = 24/4
y = 6

2x + 3y = 30
2x + 3.6 = 30
2x + 18 = 30
2x = 30 - 18
2x = 12
x = 12/2
x = 6


S={ 6, 6 }