Question

1) X+Y = 5

X-Y=7

2) X-Y=+2
2X+Y=+1

3) -X+Y=7
X+Y=1
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Answer 1

Explicação passo-a-passo:

1)

X+Y = 5

X-Y=7

2x = 12

X = 12/2

X = 6

X+Y = 5

6 + Y = 5

Y = 5 - 6

Y = - 1

2)

X-Y=+2

2X+Y=+1

3X = 3

X = 3/3

X = 1

2X+Y=+1

2.1 + Y = 1

2 + Y = 1

Y = 1 - 2

Y = - 1

3)

-X+Y=7

X+Y=1

2Y = 8

Y = 8/2

Y = 4

X+Y=1

X + 4 = 1

X = 1 - 4

X = - 3