2X + 9Y = −38X −9Y = 35 Hallar X + Y?

Question

2X + 9Y = −38 X −9Y = 35 Hallar X + Y.

Alessandrogomez · Accepted Answer

3x = - 3 x = - 1 - 2 + 9y = - 38 9y = - 36 y = - 4 x + y = - 1 - 4 = - 5.

Claralum · Answer

2x + 9y = −38

x −9y = 35

x = −38− 9y / 2

x = 35 + 9y

−38− 9y / 2 = 35 + 9y

−38− 9y = 2(35 + 9y)

−38− 9y = 70 + 18y

− 9y− 18y = 70 + 38

− 27y = 108

y = 108 / − 27

y = − 4

x −9y = 35

x− (−36) = 35

x + 36 = 35

x = − 1

Respuestas :

x = − 1

y = − 4

YHallar x + y

x + y

− 1 + (− 4)

− 1− 4 = − 5.

Mejor respuesta