Question

X-y = 2 3x+y = 1

y=x+1 y-2x=2

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Answer 1

Respuesta:

1. x = 3/4 y = -5/4

2. x = -1 y = 0

Explicación paso a paso:

1. Método de sustitución:

X-y = 2 => x = 2 + y

3x+y = 1

3(2+y) + y = 1

6 + 3y + y = 1

4y = -5 => y = -5/4 x = 3/4

Comprobación:

3/4 - (-5/4) = 2 => 8/4 = 2 => 2 = 2

2. Método de sustitución:

y=x+1

y-2x=2

x + 1 - 2x = 2

-x = 1 => x = -1 y = 0

Comprobación:

0 = -1 + 1 => 0 = 0

0 - 2(-1) = 2 => 0 + 2 = 2 => 2 = 2

RPTA:

1. x = 3/4 y = -5/4

2. x = -1 y = 0