Question

ecuaciones lineales por la regla de cramer. ×+y=70. 4×+ 2y=200. como se realiza? ​

Answer 1

Respuesta:

$\displaystyle{\rightarrow x=30}\\\\\\\displaystyle{\rightarrow y=40}$

Explicación paso a paso:

$\displaystyle{\rightarrow x+y=70}\\\\\\\displaystyle{\rightarrow 4 x=280-4y \ ..(i)}\\\\\\\displaystyle{\rightarrow 4x=200-2y \ ..(ii)}\\\\\\\displaystyle{\rightarrow 280-4y=200-2y}\\\\\\\displaystyle{\rightarrow 80=2y}\\\\\\\displaystyle{\rightarrow y=40}\\\\\\\displaystyle{\rightarrow 4x=200-80}\\\\\\\displaystyle{\rightarrow 4x=120}\\\\\\\displaystyle{\rightarrow x=30}$