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kupik [55]
3 years ago
5

Solve the system for each variable, and check your solutions.

Mathematics
1 answer:
Fantom [35]3 years ago
4 0

20.

Answer:

Step-by-step explanation:

x + z + y = 60

- x + z + y = -6   <--   (x - z = y + 6)

x + 3z + y = 40

<em>cancel out the two equations (z minus each other and y minus each other)</em>

       x + z + y = 60

-      -x + z + y = -6

________________

      2x + 0 + 0 = 66

      x = 33

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