Question

Qual o valor de x e y no sistema?
x + y = 12
2x - y = -6 ?​

Answer 1

x + y = 12
2x - y = -6
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3x = 6
x = 6/3
x = 2

x + y = 12
2 + y = 12
y = 12 - 2
y = 10

S = {(2,10)}