Question

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Answer 1

Ejercicio 1

3x - 4y = -6    

2x + 4y = 16

3x + 2x - 4y + 4y = -6 + 16

5x = 10

x = 10/5

x = 2

3x - 4y = -6

3(2) - 4y = -6

6 - 4y = -6

-4y = -6 -6

-4y = -12

y = -12/-4

y = 3

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Ejercicio 2

3x + 2y = 7     (3)

4x - 3y = -2    (2)

9x + 6y = 21

8x - 6y = -4

9x + 8x + 6y - 6y = 21 - 4

17x = 17

x = 1

3x + 2y = 7

3(1) + 2y = 7

3 + 2y = 7

2y = 7 - 3

2y = 4

y = 2

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Ejercicio 3

(x + y)/2 = x - 1

(x - y)/2 = y + 1

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

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