Question

X + y = 100
x - y = 40

Answer 1

Olá,

Vamos lá,

x + y = 100
x - y = 40


x-y=40
x = 40 + y

40 + y + y = 100
2y = 100-40
2y= 60
y= 60/2
y= 30

x - y = 40
x - 30 = 40
x = 40 + 30
x = 70

Resposta: y= 30 e x = 70

Answer 2

x + y = 100
x - y = 40
-------------
2x = 140

x = 140/2

x = 70



x + y = 100

70 + y = 100

y = 100 - 70

y = 30


S = {30,70}


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Gannicus
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