Respuesta :

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Answer:

(x, y) = (10, -5)

Step-by-step explanation:

3x + 9y = -15 (eq 1)

-5x - 9y = -5  (eq 2)

add equation 1 and 2

3x + 9y -5x -9y = -15 - 5

-2x = -20

x = 10

put value of x in equation 1

3(10) + 9y =-15

30 + 9y = -15

9y = -45

y = -5

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