Respuesta :

Answer:

20

Step-by-step explanation:

z + 4 = 3z

z - 3z = - 4

- 2z = - 4

z = - 4 / - 2

z = 2

3 - y = - 7

- y = - 7 - 3

- y = - 10

y = - 10

xy

= 2 * 10

= 20
Are you sure you copied of the Q correctly? There is no x

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