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If x, y, and z are real numbers for which

x + y - z = -8

x - y + z = 18

-x + y + z = 30

 

then what is xyz?

 Jul 31, 2021
 #1
avatar+1496 
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If x, y, and z are real numbers for which

x + y - z = -8

x - y + z = 18

-x + y + z = 30

 Then what is xyz?

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

2x = -8 + 18         x = 5

 

2y = -8 + 30         y = 11

 

2z = 18 + 30        z = 24

 

xyz = 1320

 Jul 31, 2021

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