Question

2- Determine x, y ez sabendo que:
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Answer 1

a. {x + y = 20

{y + z = 15

{z + 4 = 9

z + 4 = 9

z = 9 - 4

z = 5

y + z = 15

y + 5 = 15

y = 15 - 5

y = 10

x + y = 20

x + 10 = 20

x = 20 - 10

x = 10

b. {x - y = 15

{y - z = 2

{z - 0 = 8

z - 0 = 8

z = 8 + 0

z = 8

y - z = 2

y - 8 = 2

y = 2 + 8

y = 10

x - y = 15

x - 10 = 15

x = 15 + 10

x = 25