Question

me ajudem por favor estou precisando ​

Answer 1

Resposta:

X + Y = 100 (-0.3)

0.3X + 0.1Y = 12

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-0.3X - 0.3Y = - 30

0.3X + 0.1Y = 12

-0.3Y + 0.1Y = - 30 + 12

-0.2Y = - 18

Y = -18/-0.2

Y = 90

0.3X + 0,1x90 = 12

0.3x + 9 = 12

0.3x = 3

x = 3/0.3

x = 10