Question

Alguém ????????????????

Answer 1

Ola Rafaela

g)

-x/(x + y) = 1/2

1/x + 1/y = 2/xy

-2x = x + y
y = -3x

(x + y)/xy = 2/xy

x + y = 2
x - 3x = 2
-2x = 2
x = -1
y = 3

h)

1/2x + 3/y = -1/x

(x + y)/2 + 1 = 3/2

1/2x + 1/x  = -3/y 

1/2x + 2/2x = -3/y

3/2x = -3/y

-6x = 3y
y = -2x

(x + y)/2 = 1/2
x + y = 1
x - 2x = 1
-x = 1
x = -1
y = 2 

i)

1/x + 1/y = 9/xy
(x + y)/xy = 9/xy
x + y = 9
x - y = -5

2x = 4
x = 2
y = 7

j)

(x + y)/(x - y) + 3/2 = 1
x/y - 2 = 1/3

(x + y)/(x - y) = -1/2
x/y = 2 + 1/3 = 7/3

2x + 2y = -x + y

3x + y = 0
3x - 7y = 0 

x = 0
y = 0

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