Question

X+y=3
x-y=-7
ecuaciones​

Answer 1

Respuesta:

[x = (-2) | y = 5]

Explicación paso a paso:

[Sustitución]

[x = 3 - y]

1(3 - y) - y = -7

3 - 2y = -7

-2y = -7 - 3

-2y = -10

-y = -10/2

-y = -5

y = 5

[x = 3 - 5]

x = -2