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Resolver : x + y = - 2 y + z = 13 z + x = 21indicando : x²?

Resolver : x + y = - 2 y + z = 13 z + x = 21 indicando : x².

9Maxiiii1

En resumen

X + y = - 2 y = - 2 - x y + z = 13 ( - 2 - x) + z = 13 - x + z = 13 + 2 z - x = 15 z + x = 21 z = 21 - x 21 - x - x = 15 21 - 2x = 15 - 2x = 15 - 21 - 2x = - 6 x = - 6 / - 2 = 3 y = - 5 x = 3 z = 18 x2 = 9.

Mejor respuesta

Evekuky

4

X + y = - 2

y = - 2 - x

y + z = 13

( - 2 - x) + z = 13 - x + z = 13 + 2

z - x = 15

z + x = 21

z = 21 - x

21 - x - x = 15

21 - 2x = 15 - 2x = 15 - 21 - 2x = - 6

x = - 6 / - 2 = 3

y = - 5

x = 3

z = 18

x2 = 9.